diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index 7737cce..35ff091 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -66,16 +66,16 @@
   assert_equal(0, abs(0))
   assert_equal(2, abs(-2))
   assert_equal(3, abs(3))
-  v9.CheckDefAndScriptFailure(['abs("text")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['abs("text")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal(0, abs(0))
   assert_equal(2.0, abs(-2.0))
   assert_equal(3.0, abs(3.0))
 enddef
 
 def Test_add()
-  v9.CheckDefAndScriptFailure(['add({}, 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1226: List or Blob required for argument 1'])
-  v9.CheckDefAndScriptFailure(['add([])'], 'E119:')
-  v9.CheckDefExecFailure([
+  v9.CheckSourceDefAndScriptFailure(['add({}, 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1226: List or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['add([])'], 'E119:')
+  v9.CheckSourceDefExecFailure([
         'var ln: list<number> = [1]',
         'add(ln, "a")'],
         'E1012: Type mismatch; expected number but got string')
@@ -91,7 +91,7 @@
     enddef
     TryChange()
   END
-  v9.CheckScriptFailure(lines, 'E741:')
+  v9.CheckSourceScriptFailure(lines, 'E741:')
 enddef
 
 def Test_add_blob()
@@ -107,18 +107,18 @@
       var b: blob
       add(b, "x")
   END
-  v9.CheckDefFailure(lines, 'E1012:', 2)
+  v9.CheckSourceDefFailure(lines, 'E1012:', 2)
 
   lines =<< trim END
       add(test_null_blob(), 123)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1131:', 1)
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1131:', 1)
 
   lines =<< trim END
       var b: blob = test_null_blob()
       add(b, 123)
   END
-  v9.CheckDefExecFailure(lines, 'E1131:', 2)
+  v9.CheckSourceDefExecFailure(lines, 'E1131:', 2)
 
   # Getting variable with NULL blob fails
   lines =<< trim END
@@ -126,7 +126,7 @@
       var b: blob = test_null_blob()
       add(b, 123)
   END
-  v9.CheckScriptFailure(lines, 'E1131:', 3)
+  v9.CheckSourceScriptFailure(lines, 'E1131:', 3)
 enddef
 
 def Test_add_list()
@@ -138,18 +138,18 @@
       var l: list<number>
       add(l, "x")
   END
-  v9.CheckDefFailure(lines, 'E1012:', 2)
+  v9.CheckSourceDefFailure(lines, 'E1012:', 2)
 
   lines =<< trim END
       add(test_null_list(), 123)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1130:', 1)
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1130:', 1)
 
   lines =<< trim END
       var l: list<number> = test_null_list()
       add(l, 123)
   END
-  v9.CheckDefExecFailure(lines, 'E1130:', 2)
+  v9.CheckSourceDefExecFailure(lines, 'E1130:', 2)
 
   # Getting an uninitialized variable allocates a new list at script level
   lines =<< trim END
@@ -157,7 +157,7 @@
       var l: list<number>
       add(l, 123)
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 
   # Adding to a variable set to a NULL list fails
   lines =<< trim END
@@ -165,21 +165,21 @@
       var l: list<number> = test_null_list()
       add(l, 123)
   END
-  v9.CheckScriptFailure(lines, 'E1130:', 3)
+  v9.CheckSourceScriptFailure(lines, 'E1130:', 3)
 
   lines =<< trim END
       vim9script
       var l: list<string> = ['a']
       l->add(123)
   END
-  v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected string but got number', 3)
+  v9.CheckSourceScriptFailure(lines, 'E1012: Type mismatch; expected string but got number', 3)
 
   lines =<< trim END
       vim9script
       var l: list<string>
       l->add(123)
   END
-  v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected string but got number', 3)
+  v9.CheckSourceScriptFailure(lines, 'E1012: Type mismatch; expected string but got number', 3)
 enddef
 
 def Test_add_const()
@@ -187,26 +187,26 @@
       const l = [1, 2]
       add(l, 3)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       final l = [1, 2]
       add(l, 3)
       assert_equal([1, 2, 3], l)
   END
-  v9.CheckDefSuccess(lines)
+  v9.CheckSourceDefSuccess(lines)
 
   lines =<< trim END
       const b = 0z0102
       add(b,  0z03)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
 enddef
 
 
 def Test_and()
-  v9.CheckDefAndScriptFailure(['and("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['and(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['and("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['and(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_append()
@@ -224,12 +224,12 @@
   assert_equal("{'a': 10}", getline(1))
   append(0, function('min'))
   assert_equal("function('min')", getline(1))
-  v9.CheckDefAndScriptFailure(['append([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['append("", "x")'], 'E1209: Invalid value for a line number')
-  v9.CheckDefExecAndScriptFailure(['append(".a", "x")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['append([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['append("", "x")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(['append(".a", "x")'], 'E1209: Invalid value for a line number')
   # only get one error
   assert_fails('append("''aa", "x")', ['E1209: Invalid value for a line number: "''aa"', 'E1209:'])
-  v9.CheckDefExecAndScriptFailure(['append(-1, "x")'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefExecAndScriptFailure(['append(-1, "x")'], 'E966: Invalid line number: -1')
   bwipe!
 enddef
 
@@ -245,12 +245,12 @@
   assert_equal(['0', 'one', '1', 'two', '2', ''], getbufline(bnum, 1, '$'))
   appendbufline(bnum, 0, 'zero')
   assert_equal(['zero'], getbufline(bnum, 1))
-  v9.CheckDefAndScriptFailure(['appendbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['appendbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['appendbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
-  v9.CheckDefExecAndScriptFailure(['appendbufline(' .. bnum .. ', "$a", "x")'], 'E1030: Using a String as a Number: "$a"')
+  v9.CheckSourceDefAndScriptFailure(['appendbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['appendbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['appendbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefExecAndScriptFailure(['appendbufline(' .. bnum .. ', "$a", "x")'], 'E1030: Using a String as a Number: "$a"')
   assert_fails('appendbufline(' .. bnum .. ', "$a", "x")', ['E1030: Using a String as a Number: "$a"', 'E1030:'])
-  v9.CheckDefAndScriptFailure(['appendbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['appendbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
   bnum->bufwinid()->win_gotoid()
   appendbufline('', 0, 'numbers')
   getline(1)->assert_equal('numbers')
@@ -258,80 +258,80 @@
 enddef
 
 def Test_argc()
-  v9.CheckDefAndScriptFailure(['argc("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['argc("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_arglistid()
-  v9.CheckDefAndScriptFailure(['arglistid("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['arglistid(1, "y")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['arglistid("x", "y")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['arglistid("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['arglistid(1, "y")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['arglistid("x", "y")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_argv()
-  v9.CheckDefAndScriptFailure(['argv("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['argv(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['argv("x", "y")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['argv("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['argv(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['argv("x", "y")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_assert_beeps()
-  v9.CheckDefAndScriptFailure(['assert_beeps(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_beeps(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
 enddef
 
 def Test_assert_equalfile()
-  v9.CheckDefAndScriptFailure(['assert_equalfile(1, "f2")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['assert_equalfile("f1", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['assert_equalfile("f1", "f2", ["a"])'], ['E1013: Argument 3: type mismatch, expected string but got list<string>', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['assert_equalfile(1, "f2")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_equalfile("f1", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['assert_equalfile("f1", "f2", ["a"])'], ['E1013: Argument 3: type mismatch, expected string but got list<string>', 'E1174: String required for argument 3'])
 enddef
 
 def Test_assert_exception()
-  v9.CheckDefAndScriptFailure(['assert_exception({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['assert_exception("E1:", v:null)'], ['E1013: Argument 2: type mismatch, expected string but got special', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['assert_exception({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_exception("E1:", v:null)'], ['E1013: Argument 2: type mismatch, expected string but got special', 'E1174: String required for argument 2'])
 enddef
 
 def Test_assert_fails()
-  v9.CheckDefAndScriptFailure(['assert_fails([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['assert_fails("a", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1222: String or List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['assert_fails("a", "b", "c", "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
-  v9.CheckDefAndScriptFailure(['assert_fails("a", "b", "c", 4, 5)'], ['E1013: Argument 5: type mismatch, expected string but got number', 'E1174: String required for argument 5'])
+  v9.CheckSourceDefAndScriptFailure(['assert_fails([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_fails("a", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1222: String or List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['assert_fails("a", "b", "c", "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['assert_fails("a", "b", "c", 4, 5)'], ['E1013: Argument 5: type mismatch, expected string but got number', 'E1174: String required for argument 5'])
 enddef
 
 def Test_assert_inrange()
-  v9.CheckDefAndScriptFailure(['assert_inrange("a", 2, 3)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['assert_inrange(1, "b", 3)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['assert_inrange(1, 2, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['assert_inrange(1, 2, 3, 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['assert_inrange("a", 2, 3)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_inrange(1, "b", 3)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['assert_inrange(1, 2, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['assert_inrange(1, 2, 3, 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
 enddef
 
 def Test_assert_match()
-  v9.CheckDefAndScriptFailure(['assert_match({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', ''])
-  v9.CheckDefAndScriptFailure(['assert_match("a", 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', ''])
-  v9.CheckDefAndScriptFailure(['assert_match("a", "b", null)'], ['E1013: Argument 3: type mismatch, expected string but got special', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_match({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_match("a", 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_match("a", "b", null)'], ['E1013: Argument 3: type mismatch, expected string but got special', ''])
 enddef
 
 def Test_assert_nobeep()
-  v9.CheckDefAndScriptFailure(['assert_nobeep(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_nobeep(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
 enddef
 
 def Test_assert_notmatch()
-  v9.CheckDefAndScriptFailure(['assert_notmatch({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', ''])
-  v9.CheckDefAndScriptFailure(['assert_notmatch("a", 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', ''])
-  v9.CheckDefAndScriptFailure(['assert_notmatch("a", "b", null)'], ['E1013: Argument 3: type mismatch, expected string but got special', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_notmatch({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_notmatch("a", 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', ''])
+  v9.CheckSourceDefAndScriptFailure(['assert_notmatch("a", "b", null)'], ['E1013: Argument 3: type mismatch, expected string but got special', ''])
 enddef
 
 def Test_assert_report()
-  v9.CheckDefAndScriptFailure(['assert_report([1, 2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['assert_report([1, 2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_autocmd_add()
-  v9.CheckDefAndScriptFailure(['autocmd_add({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['autocmd_add({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
 enddef
 
 def Test_autocmd_delete()
-  v9.CheckDefAndScriptFailure(['autocmd_delete({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['autocmd_delete({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
 enddef
 
 def Test_autocmd_get()
-  v9.CheckDefAndScriptFailure(['autocmd_get(10)'], ['E1013: Argument 1: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['autocmd_get(10)'], ['E1013: Argument 1: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 1'])
 enddef
 
 def Test_balloon_show()
@@ -341,8 +341,8 @@
   assert_fails('balloon_show(10)', 'E1222:')
   assert_fails('balloon_show(true)', 'E1222:')
 
-  v9.CheckDefAndScriptFailure(['balloon_show(1.2)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['balloon_show({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['balloon_show(1.2)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['balloon_show({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
 enddef
 
 def Test_balloon_split()
@@ -354,22 +354,22 @@
 
 def Test_blob2list()
   assert_equal(['x', 'x'], blob2list(0z1234)->map((_, _) => 'x'))
-  v9.CheckDefAndScriptFailure(['blob2list(10)'], ['E1013: Argument 1: type mismatch, expected blob but got number', 'E1238: Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['blob2list(10)'], ['E1013: Argument 1: type mismatch, expected blob but got number', 'E1238: Blob required for argument 1'])
 enddef
 
 def Test_browse()
   CheckFeature browse
 
-  v9.CheckDefAndScriptFailure(['browse(2, "title", "dir", "file")'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['browse(true, 2, "dir", "file")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['browse(true, "title", 3, "file")'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
-  v9.CheckDefAndScriptFailure(['browse(true, "title", "dir", 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['browse(2, "title", "dir", "file")'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['browse(true, 2, "dir", "file")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['browse(true, "title", 3, "file")'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['browse(true, "title", "dir", 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
 enddef
 
 def Test_browsedir()
   if has('browse')
-    v9.CheckDefAndScriptFailure(['browsedir({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['browsedir("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['browsedir({}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['browsedir("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
   endif
 enddef
 
@@ -425,8 +425,8 @@
   buf = bufnr('Xdummy', true)
   buf->assert_notequal(-1)
   exe 'bwipe! ' .. buf
-  v9.CheckDefAndScriptFailure(['bufnr([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['bufnr(1, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['bufnr([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['bufnr(1, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_bufwinid()
@@ -452,23 +452,23 @@
 enddef
 
 def Test_byte2line()
-  v9.CheckDefAndScriptFailure(['byte2line("1")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['byte2line([])'], ['E1013: Argument 1: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['byte2line("1")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['byte2line([])'], ['E1013: Argument 1: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 1'])
   byte2line(0)->assert_equal(-1)
 enddef
 
 def Test_byteidx()
-  v9.CheckDefAndScriptFailure(['byteidx(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['byteidx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['byteidx("a", 0, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['byteidx(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['byteidx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['byteidx("a", 0, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
   byteidx('', 0)->assert_equal(0)
   byteidx('', 1)->assert_equal(-1)
 enddef
 
 def Test_byteidxcomp()
-  v9.CheckDefAndScriptFailure(['byteidxcomp(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['byteidxcomp("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['byteidxcomp("a", 0, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['byteidxcomp(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['byteidxcomp("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['byteidxcomp("a", 0, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
 enddef
 
 def Test_call_call()
@@ -488,20 +488,20 @@
       assert_equal('Inner', g:done)
       unlet g:done
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
   delfunc g:Inner
 
-  v9.CheckDefExecAndScriptFailure(['call(123, [2])'], 'E1256: String or function required for argument 1')
-  v9.CheckDefExecAndScriptFailure(['call(true, [2])'], 'E1256: String or function required for argument 1')
-  v9.CheckDefAndScriptFailure(['call("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['call("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['call(123, [2])'], 'E1256: String or function required for argument 1')
+  v9.CheckSourceDefExecAndScriptFailure(['call(true, [2])'], 'E1256: String or function required for argument 1')
+  v9.CheckSourceDefAndScriptFailure(['call("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['call("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_ch_canread()
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_canread(10)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_canread(10)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
   endif
 enddef
 
@@ -509,7 +509,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_close("c")'], ['E1013: Argument 1: type mismatch, expected channel but got string', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_close("c")'], ['E1013: Argument 1: type mismatch, expected channel but got string', 'E1217: Channel or Job required for argument 1'])
   endif
 enddef
 
@@ -517,7 +517,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_close_in(true)'], ['E1013: Argument 1: type mismatch, expected channel but got bool', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_close_in(true)'], ['E1013: Argument 1: type mismatch, expected channel but got bool', 'E1217: Channel or Job required for argument 1'])
   endif
 enddef
 
@@ -525,8 +525,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_evalexpr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_evalexpr(test_null_channel(), 1, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+    v9.CheckSourceDefAndScriptFailure(['ch_evalexpr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_evalexpr(test_null_channel(), 1, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   endif
 enddef
 
@@ -534,9 +534,9 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_evalraw(1, "")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_evalraw(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1221: String or Blob required for argument 2'])
-    v9.CheckDefAndScriptFailure(['ch_evalraw(test_null_channel(), "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+    v9.CheckSourceDefAndScriptFailure(['ch_evalraw(1, "")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_evalraw(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1221: String or Blob required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_evalraw(test_null_channel(), "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   endif
 enddef
 
@@ -544,8 +544,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_getbufnr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_getbufnr(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_getbufnr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_getbufnr(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
     # test empty string argument for ch_getbufnr()
     var job: job = job_start(&shell)
     g:WaitForAssert(() => assert_equal('run', job_status(job)))
@@ -558,8 +558,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_getjob(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_getjob({"a": 10})'], ['E1013: Argument 1: type mismatch, expected channel but got dict<number>', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_getjob(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_getjob({"a": 10})'], ['E1013: Argument 1: type mismatch, expected channel but got dict<number>', 'E1217: Channel or Job required for argument 1'])
     assert_equal(0, ch_getjob(test_null_channel()))
   endif
 enddef
@@ -568,7 +568,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_info([1])'], ['E1013: Argument 1: type mismatch, expected channel but got list<number>', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_info([1])'], ['E1013: Argument 1: type mismatch, expected channel but got list<number>', 'E1217: Channel or Job required for argument 1'])
   endif
 enddef
 
@@ -576,8 +576,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_log(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_log("a", 1)'], ['E1013: Argument 2: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_log(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_log("a", 1)'], ['E1013: Argument 2: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 2'])
   endif
 enddef
 
@@ -589,8 +589,8 @@
     assert_fails('ch_logfile("foo", true)', 'E1174:')
     ch_logfile('', '')->assert_equal(0)
 
-    v9.CheckDefAndScriptFailure(['ch_logfile(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_logfile("a", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_logfile(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_logfile("a", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1174: String required for argument 2'])
   endif
 enddef
 
@@ -598,9 +598,9 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_open({"a": 10}, "a")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_open("a", [1])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
-    v9.CheckDefExecAndScriptFailure(['ch_open("")'], 'E475: Invalid argument')
+    v9.CheckSourceDefAndScriptFailure(['ch_open({"a": 10}, "a")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_open("a", [1])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefExecAndScriptFailure(['ch_open("")'], 'E475: Invalid argument')
   endif
 enddef
 
@@ -608,8 +608,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_read(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_read(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_read(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_read(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
   endif
 enddef
 
@@ -617,8 +617,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_readblob(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_readblob(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_readblob(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_readblob(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
   endif
 enddef
 
@@ -626,8 +626,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_readraw(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_readraw(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_readraw(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_readraw(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
   endif
 enddef
 
@@ -635,8 +635,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_sendexpr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_sendexpr(test_null_channel(), 1, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+    v9.CheckSourceDefAndScriptFailure(['ch_sendexpr(1, "a")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_sendexpr(test_null_channel(), 1, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   endif
 enddef
 
@@ -644,9 +644,9 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_sendraw(1, "")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_sendraw(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1221: String or Blob required for argument 2'])
-    v9.CheckDefAndScriptFailure(['ch_sendraw(test_null_channel(), "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+    v9.CheckSourceDefAndScriptFailure(['ch_sendraw(1, "")'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_sendraw(test_null_channel(), 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1221: String or Blob required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_sendraw(test_null_channel(), "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   endif
 enddef
 
@@ -654,8 +654,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_setoptions(1, {})'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_setoptions(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_setoptions(1, {})'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_setoptions(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
   endif
 enddef
 
@@ -663,8 +663,8 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['ch_status(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['ch_status(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['ch_status(1)'], ['E1013: Argument 1: type mismatch, expected channel but got number', 'E1217: Channel or Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['ch_status(test_null_channel(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
   endif
 enddef
 
@@ -672,8 +672,8 @@
   char2nr('あ', true)->assert_equal(12354)
 
   assert_fails('char2nr(true)', 'E1174:')
-  v9.CheckDefAndScriptFailure(['char2nr(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['char2nr("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['char2nr(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['char2nr("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   assert_equal(97, char2nr('a', 1))
   assert_equal(97, char2nr('a', 0))
   assert_equal(97, char2nr('a', true))
@@ -687,10 +687,10 @@
 enddef
 
 def Test_charcol()
-  v9.CheckDefAndScriptFailure(['charcol(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['charcol({a: 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['charcol(".", [])'], ['E1013: Argument 2: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['charcol("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['charcol(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['charcol({a: 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['charcol(".", [])'], ['E1013: Argument 2: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['charcol("")'], 'E1209: Invalid value for a line number')
   new
   setline(1, ['abcdefgh'])
   cursor(1, 4)
@@ -701,10 +701,10 @@
 enddef
 
 def Test_charidx()
-  v9.CheckDefAndScriptFailure(['charidx(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['charidx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['charidx("a", 1, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['charidx("a", 1, 0, "")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['charidx(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['charidx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['charidx("a", 1, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['charidx("a", 1, 0, "")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
   charidx('', 0)->assert_equal(0)
   charidx('', 1)->assert_equal(-1)
 enddef
@@ -714,15 +714,15 @@
 enddef
 
 def Test_cindent()
-  v9.CheckDefAndScriptFailure(['cindent([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['cindent(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['cindent("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['cindent([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['cindent(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['cindent("")'], 'E1209: Invalid value for a line number')
   assert_equal(-1, cindent(0))
   assert_equal(0, cindent('.'))
 enddef
 
 def Test_clearmatches()
-  v9.CheckDefAndScriptFailure(['clearmatches("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['clearmatches("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_col()
@@ -735,26 +735,26 @@
 
   assert_fails('col(true)', 'E1222:')
 
-  v9.CheckDefAndScriptFailure(['col(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['col({a: 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['col(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['col(".", [])'], ['E1013: Argument 2: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['col("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['col(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['col({a: 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['col(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['col(".", [])'], ['E1013: Argument 2: type mismatch, expected number but got list<any>', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['col("")'], 'E1209: Invalid value for a line number')
   bw!
 enddef
 
 def Test_complete()
-  v9.CheckDefAndScriptFailure(['complete("1", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['complete(1, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['complete("1", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['complete(1, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
 enddef
 
 def Test_complete_add()
-  v9.CheckDefAndScriptFailure(['complete_add([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1223: String or Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['complete_add([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1223: String or Dictionary required for argument 1'])
 enddef
 
 def Test_complete_info()
-  v9.CheckDefAndScriptFailure(['complete_info("")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['complete_info({})'], ['E1013: Argument 1: type mismatch, expected list<string> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['complete_info("")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['complete_info({})'], ['E1013: Argument 1: type mismatch, expected list<string> but got dict<any>', 'E1211: List required for argument 1'])
   assert_equal({'pum_visible': 0, 'mode': '', 'selected': -1, 'items': []}, complete_info())
   assert_equal({'mode': '', 'items': []}, complete_info(['mode', 'items']))
 enddef
@@ -767,10 +767,10 @@
   assert_fails('confirm(true)', 'E1174:')
   assert_fails('confirm("yes", true)', 'E1174:')
   assert_fails('confirm("yes", "maybe", 2, true)', 'E1174:')
-  v9.CheckDefAndScriptFailure(['confirm(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['confirm("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['confirm("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['confirm("a", "b", 3, 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['confirm(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['confirm("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['confirm("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['confirm("a", "b", 3, 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
 enddef
 
 def Test_copy_return_type()
@@ -798,7 +798,7 @@
       var nll: list<list<number>> = [[1, 2]]
       nll->copy()[0]->extend(['x'])
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<number> but got list<string> in extend()')
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<number> but got list<string> in extend()')
 
   var nd: dict<number> = {a: 1, b: 2}
   assert_equal({a: 1, b: 2, c: 'x'}, nd->copy()->extend({c: 'x'}))
@@ -806,7 +806,7 @@
       var ndd: dict<dict<number>> = {a: {x: 1, y: 2}}
       ndd->copy()['a']->extend({z: 'x'})
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<number> but got dict<string> in extend()')
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<number> but got dict<string> in extend()')
 
   # after a deepcopy() the item type can also change
   var nll: list<list<number>> = [[1, 2]]
@@ -822,9 +822,9 @@
 def Test_count()
   count('ABC ABC ABC', 'b', true)->assert_equal(3)
   count('ABC ABC ABC', 'b', false)->assert_equal(0)
-  v9.CheckDefAndScriptFailure(['count(10, 1)'], 'E1225: String, List or Dictionary required for argument 1')
-  v9.CheckDefAndScriptFailure(['count("a", [1], 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['count("a", [1], 0, "b")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['count(10, 1)'], 'E1225: String, List or Dictionary required for argument 1')
+  v9.CheckSourceDefAndScriptFailure(['count("a", [1], 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['count("a", [1], 0, "b")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   count([1, 2, 2, 3], 2)->assert_equal(2)
   count([1, 2, 2, 3], 2, false, 2)->assert_equal(1)
   count({a: 1.1, b: 2.2, c: 1.1}, 1.1)->assert_equal(2)
@@ -833,9 +833,9 @@
 def Test_cscope_connection()
   CheckFeature cscope
   assert_equal(0, cscope_connection())
-  v9.CheckDefAndScriptFailure(['cscope_connection("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['cscope_connection(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['cscope_connection(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['cscope_connection("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['cscope_connection(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['cscope_connection(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
 enddef
 
 def Test_cursor()
@@ -851,35 +851,35 @@
   var lines =<< trim END
     cursor('2', 1)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1209:')
-  v9.CheckDefAndScriptFailure(['cursor(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected number but got blob', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['cursor(1, "2")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['cursor(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['cursor("", 2)'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1209:')
+  v9.CheckSourceDefAndScriptFailure(['cursor(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected number but got blob', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['cursor(1, "2")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['cursor(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['cursor("", 2)'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_debugbreak()
   CheckMSWindows
-  v9.CheckDefAndScriptFailure(['debugbreak("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['debugbreak("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_deepcopy()
-  v9.CheckDefAndScriptFailure(['deepcopy({}, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['deepcopy({}, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_delete()
   var res: bool = delete('doesnotexist')
   assert_equal(true, res)
 
-  v9.CheckDefAndScriptFailure(['delete(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['delete("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['delete("")'], 'E474: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['delete(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['delete("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['delete("")'], 'E474: Invalid argument')
 enddef
 
 def Test_deletebufline()
-  v9.CheckDefAndScriptFailure(['deletebufline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['deletebufline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['deletebufline("a", 2, 0z10)'], ['E1013: Argument 3: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['deletebufline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['deletebufline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['deletebufline("a", 2, 0z10)'], ['E1013: Argument 3: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 3'])
   new
   setline(1, ['one', 'two'])
   deletebufline('', 1)
@@ -892,58 +892,58 @@
 enddef
 
 def Test_diff_filler()
-  v9.CheckDefAndScriptFailure(['diff_filler([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['diff_filler(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['diff_filler("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['diff_filler([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['diff_filler(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['diff_filler("")'], 'E1209: Invalid value for a line number')
   assert_equal(0, diff_filler(1))
   assert_equal(0, diff_filler('.'))
 enddef
 
 def Test_diff_hlID()
-  v9.CheckDefAndScriptFailure(['diff_hlID(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['diff_hlID(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['diff_hlID("", 10)'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['diff_hlID(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['diff_hlID(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['diff_hlID("", 10)'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_digraph_get()
-  v9.CheckDefAndScriptFailure(['digraph_get(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['digraph_get("")'], 'E1214: Digraph must be just two characters')
+  v9.CheckSourceDefAndScriptFailure(['digraph_get(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['digraph_get("")'], 'E1214: Digraph must be just two characters')
 enddef
 
 def Test_digraph_getlist()
-  v9.CheckDefAndScriptFailure(['digraph_getlist(10)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['digraph_getlist("")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['digraph_getlist(10)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['digraph_getlist("")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_digraph_set()
-  v9.CheckDefAndScriptFailure(['digraph_set(10, "a")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['digraph_set("ab", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['digraph_set("", "a")'], 'E1214: Digraph must be just two characters')
+  v9.CheckSourceDefAndScriptFailure(['digraph_set(10, "a")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['digraph_set("ab", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['digraph_set("", "a")'], 'E1214: Digraph must be just two characters')
 enddef
 
 def Test_digraph_setlist()
-  v9.CheckDefAndScriptFailure(['digraph_setlist("a")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1216: digraph_setlist() argument must be a list of lists with two items'])
-  v9.CheckDefAndScriptFailure(['digraph_setlist({})'], ['E1013: Argument 1: type mismatch, expected list<string> but got dict<any>', 'E1216: digraph_setlist() argument must be a list of lists with two items'])
+  v9.CheckSourceDefAndScriptFailure(['digraph_setlist("a")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1216: digraph_setlist() argument must be a list of lists with two items'])
+  v9.CheckSourceDefAndScriptFailure(['digraph_setlist({})'], ['E1013: Argument 1: type mismatch, expected list<string> but got dict<any>', 'E1216: digraph_setlist() argument must be a list of lists with two items'])
 enddef
 
 def Test_echoraw()
-  v9.CheckDefAndScriptFailure(['echoraw(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['echoraw(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['echoraw(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['echoraw(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_escape()
-  v9.CheckDefAndScriptFailure(['escape(10, " ")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['escape(true, false)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['escape("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['escape(10, " ")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['escape(true, false)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['escape("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   assert_equal('a\:b', escape("a:b", ":"))
   escape('abc', '')->assert_equal('abc')
   escape('', ':')->assert_equal('')
 enddef
 
 def Test_eval()
-  v9.CheckDefAndScriptFailure(['eval(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['eval(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['eval("")'], 'E15: Invalid expression')
+  v9.CheckSourceDefAndScriptFailure(['eval(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['eval(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['eval("")'], 'E15: Invalid expression')
   assert_equal(2, eval('1 + 1'))
 enddef
 
@@ -951,8 +951,8 @@
   assert_false(executable(""))
   assert_false(executable(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo executable(123)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo executable(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo executable(123)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo executable(true)'], 'E1013:')
 enddef
 
 def Test_execute()
@@ -961,22 +961,22 @@
   res = execute(["echo 'here'", "echo 'there'"])
   assert_equal("\nhere\nthere", res)
 
-  v9.CheckDefAndScriptFailure(['execute(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
-  v9.CheckDefFailure(['execute([123])'], 'E1013: Argument 1: type mismatch, expected list<string> but got list<number>')
-  v9.CheckDefExecFailure(['echo execute(["xx", 123])'], 'E492')
-  v9.CheckDefAndScriptFailure(['execute("xx", 123)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['execute(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefFailure(['execute([123])'], 'E1013: Argument 1: type mismatch, expected list<string> but got list<number>')
+  v9.CheckSourceDefExecFailure(['echo execute(["xx", 123])'], 'E492')
+  v9.CheckSourceDefAndScriptFailure(['execute("xx", 123)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_exepath()
-  v9.CheckDefExecFailure(['echo exepath(true)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo exepath(v:null)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo exepath("")'], 'E1175:')
+  v9.CheckSourceDefExecFailure(['echo exepath(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo exepath(v:null)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo exepath("")'], 'E1175:')
 enddef
 
 command DoSomeCommand let g:didSomeCommand = 4
 
 def Test_exists()
-  v9.CheckDefAndScriptFailure(['exists(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['exists(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   call assert_equal(1, exists('&tabstop'))
 
   var lines =<< trim END
@@ -985,14 +985,14 @@
       endif
     endif
   END
-  v9.CheckDefFailure(lines, 'E113:')
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceDefFailure(lines, 'E113:')
+  v9.CheckSourceScriptSuccess(lines)
 enddef
 
 def Test_exists_compiled()
   call assert_equal(1, exists_compiled('&tabstop'))
-  v9.CheckDefAndScriptFailure(['exists_compiled(10)'], ['E1232:', 'E1233:'])
-  v9.CheckDefAndScriptFailure(['exists_compiled(v:progname)'], ['E1232:', 'E1233:'])
+  v9.CheckSourceDefAndScriptFailure(['exists_compiled(10)'], ['E1232:', 'E1233:'])
+  v9.CheckSourceDefAndScriptFailure(['exists_compiled(v:progname)'], ['E1232:', 'E1233:'])
 
   if exists_compiled('+newoption')
     if &newoption == 'ok'
@@ -1044,9 +1044,9 @@
   split SomeFile
   expand('%', true, true)->assert_equal(['SomeFile'])
   close
-  v9.CheckDefAndScriptFailure(['expand(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['expand("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['expand("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['expand(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['expand("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['expand("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
   expand('')->assert_equal('')
 
   var caught = false
@@ -1065,8 +1065,8 @@
   assert_equal("yes", expandcmd("`={a: 'yes'}['a']`"))
   expandcmd('')->assert_equal('')
 
-  v9.CheckDefAndScriptFailure(['expandcmd([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['expandcmd("abc", [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['expandcmd([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['expandcmd("abc", [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_extend_arg_types()
@@ -1093,7 +1093,7 @@
       dany->extend({b: 'x'})
       assert_equal({a: 0, b: 'x'}, dany)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
       assert_equal([1, 2, "x"], extend([1, 2], ["x"]))
@@ -1101,17 +1101,17 @@
 
       assert_equal({a: 1, b: "x"}, extend({a: 1}, {b: "x"}))
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
-  v9.CheckDefAndScriptFailure(['extend("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E712: Argument of extend() must be a List or Dictionary'])
-  v9.CheckDefAndScriptFailure(['extend([1, 2], 3)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E712: Argument of extend() must be a List or Dictionary'])
-  v9.CheckDefAndScriptFailure(['var ll = [1, 2]', 'extend(ll, ["x"])'], ['E1013: Argument 2: type mismatch, expected list<number> but got list<string>', 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>'])
-  v9.CheckDefFailure(['extend([1, 2], [3], "x")'], 'E1013: Argument 3: type mismatch, expected number but got string')
+  v9.CheckSourceDefAndScriptFailure(['extend("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E712: Argument of extend() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['extend([1, 2], 3)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E712: Argument of extend() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['var ll = [1, 2]', 'extend(ll, ["x"])'], ['E1013: Argument 2: type mismatch, expected list<number> but got list<string>', 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>'])
+  v9.CheckSourceDefFailure(['extend([1, 2], [3], "x")'], 'E1013: Argument 3: type mismatch, expected number but got string')
 
-  v9.CheckDefFailure(['extend({a: 1}, 42)'], 'E1013: Argument 2: type mismatch, expected dict<any> but got number')
-  v9.CheckDefFailure(['extend({a: 1}, {b: 2}, 1)'], 'E1013: Argument 3: type mismatch, expected string but got number')
+  v9.CheckSourceDefFailure(['extend({a: 1}, 42)'], 'E1013: Argument 2: type mismatch, expected dict<any> but got number')
+  v9.CheckSourceDefFailure(['extend({a: 1}, {b: 2}, 1)'], 'E1013: Argument 3: type mismatch, expected string but got number')
 
-  v9.CheckScriptFailure(['vim9script', 'var l = [1]', 'extend(l, ["b", 1])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<any> in extend()')
+  v9.CheckSourceScriptFailure(['vim9script', 'var l = [1]', 'extend(l, ["b", 1])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<any> in extend()')
 enddef
 
 func g:ExtendDict(d)
@@ -1123,26 +1123,26 @@
        var d: dict<number> = {a: 1}
        extend(d, {b: 2})
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
        var d: dict<number> = {a: 1}
        extend(d, {b: 'x'})
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<number> but got dict<string>', 2)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<number> but got dict<string>', 2)
 
   lines =<< trim END
        var d: dict<number> = {a: 1}
        g:ExtendDict(d)
   END
-  v9.CheckDefExecFailure(lines, 'E1012: Type mismatch; expected number but got string', 0)
-  v9.CheckScriptFailure(['vim9script'] + lines, 'E1012:', 1)
+  v9.CheckSourceDefExecFailure(lines, 'E1012: Type mismatch; expected number but got string', 0)
+  v9.CheckSourceScriptFailure(['vim9script'] + lines, 'E1012:', 1)
 
   lines =<< trim END
        var d: dict<bool>
        extend(d, {b: 0})
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<bool> but got dict<number>', 2)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected dict<bool> but got dict<number>', 2)
 enddef
 
 func g:ExtendList(l)
@@ -1154,26 +1154,26 @@
        var l: list<number> = [1]
        extend(l, [2])
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
        var l: list<number> = [1]
        extend(l, ['x'])
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>', 2)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>', 2)
 
   lines =<< trim END
        var l: list<number> = [1]
        g:ExtendList(l)
   END
-  v9.CheckDefExecFailure(lines, 'E1012: Type mismatch; expected number but got string', 0)
-  v9.CheckScriptFailure(['vim9script'] + lines, 'E1012:', 1)
+  v9.CheckSourceDefExecFailure(lines, 'E1012: Type mismatch; expected number but got string', 0)
+  v9.CheckSourceScriptFailure(['vim9script'] + lines, 'E1012:', 1)
 
   lines =<< trim END
        var l: list<bool>
        extend(l, [0])
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<bool> but got list<number>', 2)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1013: Argument 2: type mismatch, expected list<bool> but got list<number>', 2)
 enddef
 
 def Test_extend_return_type()
@@ -1203,7 +1203,7 @@
 
       Test()
   END
-  v9.CheckScriptFailure(lines, 'E1001: Variable not found: m')
+  v9.CheckSourceScriptFailure(lines, 'E1001: Variable not found: m')
 enddef
 
 def Test_extend_const()
@@ -1211,20 +1211,20 @@
       const l = [1, 2]
       extend(l, [3])
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       const d = {a: 1, b: 2}
       extend(d, {c: 3})
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
 
   lines =<< trim END
       final d = {a: 1, b: 2}
       extend(d, {c: 3})
       assert_equal({a: 1, b: 2, c: 3}, d)
   END
-  v9.CheckDefSuccess(lines)
+  v9.CheckSourceDefSuccess(lines)
 
   # item in a for loop is final
   lines =<< trim END
@@ -1233,23 +1233,23 @@
         item->extend({x: 2})
       endfor
   END
-  v9.CheckDefSuccess(lines)
+  v9.CheckSourceDefSuccess(lines)
 enddef
 
 def Test_extendnew()
   assert_equal([1, 2, 'a'], extendnew([1, 2], ['a']))
   assert_equal({one: 1, two: 'a'}, extendnew({one: 1}, {two: 'a'}))
 
-  v9.CheckDefAndScriptFailure(['extendnew({a: 1}, 42)'], ['E1013: Argument 2: type mismatch, expected dict<number> but got number', 'E712: Argument of extendnew() must be a List or Dictionary'])
-  v9.CheckDefAndScriptFailure(['extendnew({a: 1}, [42])'], ['E1013: Argument 2: type mismatch, expected dict<number> but got list<number>', 'E712: Argument of extendnew() must be a List or Dictionary'])
-  v9.CheckDefAndScriptFailure(['extendnew([1, 2], "x")'], ['E1013: Argument 2: type mismatch, expected list<number> but got string', 'E712: Argument of extendnew() must be a List or Dictionary'])
-  v9.CheckDefAndScriptFailure(['extendnew([1, 2], {x: 1})'], ['E1013: Argument 2: type mismatch, expected list<number> but got dict<number>', 'E712: Argument of extendnew() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['extendnew({a: 1}, 42)'], ['E1013: Argument 2: type mismatch, expected dict<number> but got number', 'E712: Argument of extendnew() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['extendnew({a: 1}, [42])'], ['E1013: Argument 2: type mismatch, expected dict<number> but got list<number>', 'E712: Argument of extendnew() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['extendnew([1, 2], "x")'], ['E1013: Argument 2: type mismatch, expected list<number> but got string', 'E712: Argument of extendnew() must be a List or Dictionary'])
+  v9.CheckSourceDefAndScriptFailure(['extendnew([1, 2], {x: 1})'], ['E1013: Argument 2: type mismatch, expected list<number> but got dict<number>', 'E712: Argument of extendnew() must be a List or Dictionary'])
 enddef
 
 def Test_feedkeys()
-  v9.CheckDefAndScriptFailure(['feedkeys(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['feedkeys("x", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['feedkeys([], {})'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['feedkeys(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['feedkeys("x", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['feedkeys([], {})'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
   g:TestVar = 1
   feedkeys(":g:TestVar = 789\n", 'xt')
   assert_equal(789, g:TestVar)
@@ -1260,16 +1260,16 @@
   assert_false(filereadable(""))
   assert_false(filereadable(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo filereadable(123)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo filereadable(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo filereadable(123)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo filereadable(true)'], 'E1013:')
 enddef
 
 def Test_filewritable()
   assert_false(filewritable(""))
   assert_false(filewritable(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo filewritable(123)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo filewritable(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo filewritable(123)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo filewritable(true)'], 'E1013:')
 enddef
 
 def Test_finddir()
@@ -1278,20 +1278,20 @@
   var lines =<< trim END
       var l: list<string> = finddir('nothing', '*;', -1)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
   delete('Xtestdir', 'rf')
 
-  v9.CheckDefAndScriptFailure(['finddir(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['finddir(v:null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
-  v9.CheckDefExecFailure(['echo finddir("")'], 'E1175:')
-  v9.CheckDefAndScriptFailure(['finddir("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['finddir("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['finddir(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['finddir(v:null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecFailure(['echo finddir("")'], 'E1175:')
+  v9.CheckSourceDefAndScriptFailure(['finddir("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['finddir("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   finddir('abc', '')->assert_equal('')
 
-  v9.CheckDefFailure(['var s: list<string> = finddir("foo")'], 'E1012: Type mismatch; expected list<string> but got string')
-  v9.CheckDefFailure(['var s: list<string> = finddir("foo", "path")'], 'E1012: Type mismatch; expected list<string> but got string')
+  v9.CheckSourceDefFailure(['var s: list<string> = finddir("foo")'], 'E1012: Type mismatch; expected list<string> but got string')
+  v9.CheckSourceDefFailure(['var s: list<string> = finddir("foo", "path")'], 'E1012: Type mismatch; expected list<string> but got string')
   # with third argument only runtime type checking
-  v9.CheckDefCompileSuccess(['var s: list<string> = finddir("foo", "path", 1)'])
+  v9.CheckSourceDefCompileSuccess(['var s: list<string> = finddir("foo", "path", 1)'])
 enddef
 
 def Test_findfile()
@@ -1299,13 +1299,13 @@
   var lines =<< trim END
       var l: list<string> = findfile('nothing', '*;', -1)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
-  v9.CheckDefExecFailure(['findfile(true)'], 'E1013: Argument 1: type mismatch, expected string but got bool')
-  v9.CheckDefExecFailure(['findfile(v:null)'], 'E1013: Argument 1: type mismatch, expected string but got special')
-  v9.CheckDefExecFailure(['findfile("")'], 'E1175:')
-  v9.CheckDefAndScriptFailure(['findfile("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['findfile("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefExecFailure(['findfile(true)'], 'E1013: Argument 1: type mismatch, expected string but got bool')
+  v9.CheckSourceDefExecFailure(['findfile(v:null)'], 'E1013: Argument 1: type mismatch, expected string but got special')
+  v9.CheckSourceDefExecFailure(['findfile("")'], 'E1175:')
+  v9.CheckSourceDefAndScriptFailure(['findfile("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['findfile("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   findfile('abc', '')->assert_equal('')
 enddef
 
@@ -1313,7 +1313,7 @@
   var lines =<< trim END
       echo flatten([1, 2, 3])
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1158:')
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1158:')
 enddef
 
 def Test_flattennew()
@@ -1328,106 +1328,106 @@
       var ll: list<list<string>> = [['a', 'b', 'c']]
       assert_equal(['a', 'b', 'c'], ll->flattennew())
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
-  v9.CheckDefAndScriptFailure(['flattennew({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['flattennew([], "1")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['flattennew({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['flattennew([], "1")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 " Test for float functions argument type
 def Test_float_funcs_args()
   # acos()
-  v9.CheckDefAndScriptFailure(['acos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['acos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('1.570796', string(acos(0.0)))
   # asin()
-  v9.CheckDefAndScriptFailure(['asin("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['asin("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(asin(0.0)))
   # atan()
-  v9.CheckDefAndScriptFailure(['atan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['atan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(atan(0.0)))
   # atan2()
-  v9.CheckDefAndScriptFailure(['atan2("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['atan2("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('-2.356194', string(atan2(-1, -1)))
-  v9.CheckDefAndScriptFailure(['atan2(1.2, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['atan2(1.2)'], ['E119:', 'E119:'])
+  v9.CheckSourceDefAndScriptFailure(['atan2(1.2, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['atan2(1.2)'], ['E119:', 'E119:'])
   # ceil()
-  v9.CheckDefAndScriptFailure(['ceil("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['ceil("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('2.0', string(ceil(2.0)))
   # cos()
-  v9.CheckDefAndScriptFailure(['cos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['cos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('1.0', string(cos(0.0)))
   # cosh()
-  v9.CheckDefAndScriptFailure(['cosh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['cosh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('1.0', string(cosh(0.0)))
   # exp()
-  v9.CheckDefAndScriptFailure(['exp("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['exp("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('1.0', string(exp(0.0)))
   # float2nr()
-  v9.CheckDefAndScriptFailure(['float2nr("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['float2nr("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal(1, float2nr(1.234))
   # floor()
-  v9.CheckDefAndScriptFailure(['floor("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['floor("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('2.0', string(floor(2.0)))
   # fmod()
-  v9.CheckDefAndScriptFailure(['fmod(1.1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['fmod("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['fmod(1.1)'], ['E119:', 'E119:'])
+  v9.CheckSourceDefAndScriptFailure(['fmod(1.1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['fmod("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['fmod(1.1)'], ['E119:', 'E119:'])
   assert_equal('0.13', string(fmod(12.33, 1.22)))
   # isinf()
-  v9.CheckDefAndScriptFailure(['isinf("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['isinf("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal(1, isinf(1.0 / 0.0))
   # isnan()
-  v9.CheckDefAndScriptFailure(['isnan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['isnan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_true(isnan(0.0 / 0.0))
   # log()
-  v9.CheckDefAndScriptFailure(['log("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['log("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(log(1.0)))
   # log10()
-  v9.CheckDefAndScriptFailure(['log10("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['log10("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(log10(1.0)))
   # pow()
-  v9.CheckDefAndScriptFailure(['pow("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['pow(1.1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['pow(1.1)'], ['E119:', 'E119:'])
+  v9.CheckSourceDefAndScriptFailure(['pow("a", 1.1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['pow(1.1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['pow(1.1)'], ['E119:', 'E119:'])
   assert_equal('1.0', string(pow(0.0, 0.0)))
   # round()
-  v9.CheckDefAndScriptFailure(['round("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['round("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('2.0', string(round(2.1)))
   # sin()
-  v9.CheckDefAndScriptFailure(['sin("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sin("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(sin(0.0)))
   # sinh()
-  v9.CheckDefAndScriptFailure(['sinh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sinh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(sinh(0.0)))
   # sqrt()
-  v9.CheckDefAndScriptFailure(['sqrt("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sqrt("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(sqrt(0.0)))
   # tan()
-  v9.CheckDefAndScriptFailure(['tan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tan("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(tan(0.0)))
   # tanh()
-  v9.CheckDefAndScriptFailure(['tanh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tanh("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('0.0', string(tanh(0.0)))
   # trunc()
-  v9.CheckDefAndScriptFailure(['trunc("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['trunc("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1219: Float or Number required for argument 1'])
   assert_equal('2.0', string(trunc(2.1)))
 enddef
 
 def Test_fnameescape()
-  v9.CheckDefAndScriptFailure(['fnameescape(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['fnameescape(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal('\+a\%b\|', fnameescape('+a%b|'))
   fnameescape('')->assert_equal('')
 enddef
 
 def Test_fnamemodify()
-  v9.CheckDefSuccess(['echo fnamemodify(test_null_string(), ":p")'])
-  v9.CheckDefSuccess(['echo fnamemodify("", ":p")'])
-  v9.CheckDefSuccess(['echo fnamemodify("file", test_null_string())'])
-  v9.CheckDefSuccess(['echo fnamemodify("file", "")'])
+  v9.CheckSourceDefSuccess(['echo fnamemodify(test_null_string(), ":p")'])
+  v9.CheckSourceDefSuccess(['echo fnamemodify("", ":p")'])
+  v9.CheckSourceDefSuccess(['echo fnamemodify("file", test_null_string())'])
+  v9.CheckSourceDefSuccess(['echo fnamemodify("file", "")'])
 
-  v9.CheckDefExecFailure(['echo fnamemodify(true, ":p")'], 'E1013: Argument 1: type mismatch, expected string but got bool')
-  v9.CheckDefExecFailure(['echo fnamemodify(v:null, ":p")'], 'E1013: Argument 1: type mismatch, expected string but got special')
-  v9.CheckDefExecFailure(['echo fnamemodify("file", true)'],  'E1013: Argument 2: type mismatch, expected string but got bool')
+  v9.CheckSourceDefExecFailure(['echo fnamemodify(true, ":p")'], 'E1013: Argument 1: type mismatch, expected string but got bool')
+  v9.CheckSourceDefExecFailure(['echo fnamemodify(v:null, ":p")'], 'E1013: Argument 1: type mismatch, expected string but got special')
+  v9.CheckSourceDefExecFailure(['echo fnamemodify("file", true)'],  'E1013: Argument 2: type mismatch, expected string but got bool')
 enddef
 
 def Wrong_dict_key_type(items: list<number>): list<number>
@@ -1454,10 +1454,10 @@
       enddef
       assert_equal(['xxx'], Func())
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 
-  v9.CheckDefAndScriptFailure(['filter(1.1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got float', 'E1251: List, Dictionary, Blob or String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['filter([1, 2], 4)'], ['E1256: String or function required for argument 2', 'E1024: Using a Number as a String'])
+  v9.CheckSourceDefAndScriptFailure(['filter(1.1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got float', 'E1251: List, Dictionary, Blob or String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['filter([1, 2], 4)'], ['E1256: String or function required for argument 2', 'E1024: Using a Number as a String'])
 
   lines =<< trim END
     def F(i: number, v: any): string
@@ -1465,51 +1465,51 @@
     enddef
     echo filter([1, 2, 3], F)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool but got func(number, any): string', 'E1135: Using a String as a Bool:'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool but got func(number, any): string', 'E1135: Using a String as a Bool:'])
 
   # check first function argument type
   lines =<< trim END
     var l = [1, 2, 3]
     filter(l, (i: string, v: number) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(string, number): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(string, number): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
   lines =<< trim END
     var d = {a: 1}
     filter(d, (i: number, v: number) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): bool but got func(number, number): bool', 'E1013: Argument 1: type mismatch, expected number but got string'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): bool but got func(number, number): bool', 'E1013: Argument 1: type mismatch, expected number but got string'])
   lines =<< trim END
     var b = 0z1122
     filter(b, (i: string, v: number) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(string, number): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(string, number): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
   lines =<< trim END
     var s = 'text'
     filter(s, (i: string, v: string) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?string): bool but got func(string, string): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?string): bool but got func(string, string): bool', 'E1013: Argument 1: type mismatch, expected string but got number'])
 
   # check second function argument type
   lines =<< trim END
     var l = [1, 2, 3]
     filter(l, (i: number, v: string) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(number, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(number, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
   lines =<< trim END
     var d = {a: 1}
     filter(d, (i: string, v: string) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): bool but got func(string, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): bool but got func(string, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
   lines =<< trim END
     var b = 0z1122
     filter(b, (i: number, v: string) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(number, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): bool but got func(number, string): bool', 'E1013: Argument 2: type mismatch, expected string but got number'])
   lines =<< trim END
     var s = 'text'
     filter(s, (i: number, v: number) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?string): bool but got func(number, number): bool', 'E1013: Argument 2: type mismatch, expected number but got string'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?string): bool but got func(number, number): bool', 'E1013: Argument 2: type mismatch, expected number but got string'])
 enddef
 
 def Test_filter_wrong_dict_key_type()
@@ -1536,39 +1536,39 @@
       const l = [1, 2, 3]
       filter(l, 'v:val == 2')
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       const d = {a: 1, b: 2}
       filter(d, 'v:val == 2')
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
 enddef
 
 def Test_foldclosed()
-  v9.CheckDefAndScriptFailure(['foldclosed(function("min"))'], ['E1013: Argument 1: type mismatch, expected string but got func(...): unknown', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['foldclosed("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['foldclosed(function("min"))'], ['E1013: Argument 1: type mismatch, expected string but got func(...): unknown', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['foldclosed("")'], 'E1209: Invalid value for a line number')
   assert_equal(-1, foldclosed(1))
   assert_equal(-1, foldclosed('$'))
 enddef
 
 def Test_foldclosedend()
-  v9.CheckDefAndScriptFailure(['foldclosedend(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['foldclosedend("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['foldclosedend(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['foldclosedend("")'], 'E1209: Invalid value for a line number')
   assert_equal(-1, foldclosedend(1))
   assert_equal(-1, foldclosedend('w0'))
 enddef
 
 def Test_foldlevel()
-  v9.CheckDefAndScriptFailure(['foldlevel(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['foldlevel("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['foldlevel(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['foldlevel("")'], 'E1209: Invalid value for a line number')
   assert_equal(0, foldlevel(1))
   assert_equal(0, foldlevel('.'))
 enddef
 
 def Test_foldtextresult()
-  v9.CheckDefAndScriptFailure(['foldtextresult(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['foldtextresult("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['foldtextresult(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['foldtextresult("")'], 'E1209: Invalid value for a line number')
   assert_equal('', foldtextresult(1))
   assert_equal('', foldtextresult('.'))
 enddef
@@ -1605,8 +1605,8 @@
 enddef
 
 def Test_funcref()
-  v9.CheckDefAndScriptFailure(['funcref("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['funcref("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['funcref("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['funcref("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 
   var lines =<< trim END
       vim9script
@@ -1623,7 +1623,7 @@
       defcompile
       GetRefOk()
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 
   lines =<< trim END
       vim9script
@@ -1635,14 +1635,14 @@
       enddef
       GetRefBad()
   END
-  v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected func(number) but got func(bool)')
+  v9.CheckSourceScriptFailure(lines, 'E1012: Type mismatch; expected func(number) but got func(bool)')
 enddef
 
 def Test_function()
-  v9.CheckDefExecAndScriptFailure(['function(123)'], 'E1256: String or function required for argument 1')
+  v9.CheckSourceDefExecAndScriptFailure(['function(123)'], 'E1256: String or function required for argument 1')
 
-  v9.CheckDefAndScriptFailure(['function("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['function("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['function("reverse", 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['function("reverse", [2], [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 
   var lines =<< trim END
       vim9script
@@ -1659,7 +1659,7 @@
       defcompile
       GetRefOk()
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 
   lines =<< trim END
       vim9script
@@ -1671,17 +1671,17 @@
       enddef
       GetRefBad()
   END
-  v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected func(number) but got func(bool)')
+  v9.CheckSourceScriptFailure(lines, 'E1012: Type mismatch; expected func(number) but got func(bool)')
 enddef
 
 def Test_garbagecollect()
   garbagecollect(true)
-  v9.CheckDefAndScriptFailure(['garbagecollect("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['garbagecollect(20)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['garbagecollect("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['garbagecollect(20)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_get()
-  v9.CheckDefAndScriptFailure(['get("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E896: Argument of get() must be a List, Dictionary or Blob'])
+  v9.CheckSourceDefAndScriptFailure(['get("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E896: Argument of get() must be a List, Dictionary or Blob'])
   [3, 5, 2]->get(1)->assert_equal(5)
   [3, 5, 2]->get(3)->assert_equal(0)
   [3, 5, 2]->get(3, 9)->assert_equal(9)
@@ -1701,7 +1701,7 @@
       enddef
       assert_equal(0, DoThat())
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 enddef
 
 def Test_getbufinfo()
@@ -1714,7 +1714,7 @@
   getbufinfo({bufloaded: true, buflisted: true, bufmodified: false})
       ->len()->assert_equal(3)
   bwipe Xtestfile1 Xtestfile2
-  v9.CheckDefAndScriptFailure(['getbufinfo(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getbufinfo(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
 enddef
 
 def Test_getbufline()
@@ -1738,17 +1738,17 @@
   assert_fails('getbufoneline("", "$a")', ['E1030: Using a String as a Number: "$a"', 'E1030: Using a String as a Number: "$a"'])
   bwipe!
 
-  v9.CheckDefAndScriptFailure(['getbufline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getbufline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['getbufline("a", 2, 0z10)'], ['E1013: Argument 3: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['getbufline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getbufline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getbufline("a", 2, 0z10)'], ['E1013: Argument 3: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 3'])
 
-  v9.CheckDefAndScriptFailure(['getbufoneline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getbufoneline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getbufoneline([], 2)'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getbufoneline("a", [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 2'])
 enddef
 
 def Test_getbufvar()
-  v9.CheckDefAndScriptFailure(['getbufvar(true, "v")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getbufvar(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getbufvar(true, "v")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getbufvar(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_getchangelist()
@@ -1764,21 +1764,21 @@
   endwhile
   getchar(true)->assert_equal(0)
   getchar(1)->assert_equal(0)
-  v9.CheckDefAndScriptFailure(['getchar(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getchar("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getchar(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getchar("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_getcharpos()
   assert_equal(['x', 'x', 'x', 'x'], getcharpos('.')->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getcharpos(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getcharpos(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['getcharpos("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['getcharpos(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcharpos(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['getcharpos("")'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_getcharstr()
-  v9.CheckDefAndScriptFailure(['getcharstr(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getcharstr("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcharstr(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcharstr("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_getcompletion()
@@ -1786,29 +1786,29 @@
   var l = getcompletion('run', 'file', true)
   l->assert_equal([])
   set wildignore&
-  v9.CheckDefAndScriptFailure(['getcompletion(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getcompletion("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['getcompletion("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['getcompletion("a", "")'], 'E475: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['getcompletion(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcompletion("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getcompletion("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['getcompletion("a", "")'], 'E475: Invalid argument')
   getcompletion('', 'messages')->assert_equal(['clear'])
 enddef
 
 def Test_getcurpos()
   assert_equal(['x', 'x', 'x', 'x', 'x'], getcurpos()->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getcurpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcurpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_getcursorcharpos()
   assert_equal(['x', 'x', 'x', 'x', 'x'], getcursorcharpos()->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getcursorcharpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcursorcharpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_getcwd()
-  v9.CheckDefAndScriptFailure(['getcwd("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getcwd("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getcwd(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getcwd("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcwd("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getcwd(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_getenv()
@@ -1827,7 +1827,7 @@
 enddef
 
 def Test_getfontname()
-  v9.CheckDefAndScriptFailure(['getfontname(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getfontname(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   #getfontname('')->assert_equal('')
 enddef
 
@@ -1835,38 +1835,38 @@
   assert_equal('', getfperm(""))
   assert_equal('', getfperm(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo getfperm(true)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo getfperm(v:null)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getfperm(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getfperm(v:null)'], 'E1013:')
 enddef
 
 def Test_getfsize()
   assert_equal(-1, getfsize(""))
   assert_equal(-1, getfsize(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo getfsize(true)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo getfsize(v:null)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getfsize(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getfsize(v:null)'], 'E1013:')
 enddef
 
 def Test_getftime()
   assert_equal(-1, getftime(""))
   assert_equal(-1, getftime(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo getftime(true)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo getftime(v:null)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getftime(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getftime(v:null)'], 'E1013:')
 enddef
 
 def Test_getftype()
   assert_equal('', getftype(""))
   assert_equal('', getftype(test_null_string()))
 
-  v9.CheckDefExecFailure(['echo getftype(true)'], 'E1013:')
-  v9.CheckDefExecFailure(['echo getftype(v:null)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getftype(true)'], 'E1013:')
+  v9.CheckSourceDefExecFailure(['echo getftype(v:null)'], 'E1013:')
 enddef
 
 def Test_getjumplist()
-  v9.CheckDefAndScriptFailure(['getjumplist("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getjumplist("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getjumplist(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getjumplist("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getjumplist("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getjumplist(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_getline()
@@ -1882,20 +1882,20 @@
 
       assert_equal([3, 3, 3], getline(1, 3)->map((_, _) => 3))
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
       echo getline('1')
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1209:')
-  v9.CheckDefAndScriptFailure(['getline(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getline(1, true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['getline("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1209:')
+  v9.CheckSourceDefAndScriptFailure(['getline(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getline(1, true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['getline("")'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_getloclist()
-  v9.CheckDefAndScriptFailure(['getloclist("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getloclist(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getloclist("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getloclist(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_getloclist_return_type()
@@ -1907,26 +1907,26 @@
 enddef
 
 def Test_getmarklist()
-  v9.CheckDefAndScriptFailure(['getmarklist([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getmarklist([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
   assert_equal([], getmarklist(10000))
   assert_fails('getmarklist("a%b@#")', 'E94:')
 enddef
 
 def Test_getmatches()
-  v9.CheckDefAndScriptFailure(['getmatches("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getmatches("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_getpos()
   assert_equal(['x', 'x', 'x', 'x'], getpos('.')->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getpos(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getpos(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal([0, 1, 1, 0], getpos('.'))
-  v9.CheckDefExecFailure(['getpos("a")'], 'E1209:')
-  v9.CheckDefExecAndScriptFailure(['getpos("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecFailure(['getpos("a")'], 'E1209:')
+  v9.CheckSourceDefExecAndScriptFailure(['getpos("")'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_getqflist()
-  v9.CheckDefAndScriptFailure(['getqflist([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getqflist([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
   call assert_equal({}, getqflist({}))
 enddef
 
@@ -1945,9 +1945,9 @@
   assert_equal([7, 7, 7], getreg('a', true, true)->map((_, _) => 7))
 
   assert_fails('getreg("ab")', 'E1162:')
-  v9.CheckDefAndScriptFailure(['getreg(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getreg(".", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['getreg(".", 1, "b")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['getreg(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getreg(".", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getreg(".", 1, "b")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
   @" = 'A1B2C3'
   getreg('')->assert_equal('A1B2C3')
 enddef
@@ -1977,7 +1977,7 @@
 enddef
 
 def Test_getscriptinfo()
-  v9.CheckDefAndScriptFailure(['getscriptinfo("x")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getscriptinfo("x")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 1'])
 
   var lines1 =<< trim END
     vim9script
@@ -2016,78 +2016,78 @@
       assert_true(index(l[0].functions, f) != -1)
     endfor
   END
-  v9.CheckDefAndScriptSuccess(lines2)
+  v9.CheckSourceDefAndScriptSuccess(lines2)
 enddef
 
 def Test_gettabinfo()
-  v9.CheckDefAndScriptFailure(['gettabinfo("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['gettabinfo("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_gettabvar()
-  v9.CheckDefAndScriptFailure(['gettabvar("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['gettabvar(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['gettabvar("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['gettabvar(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_gettabwinvar()
-  v9.CheckDefAndScriptFailure(['gettabwinvar("a", 2, "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['gettabwinvar(1, "b", "c", [])'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['gettabwinvar(1, 1, 3, {})'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['gettabwinvar("a", 2, "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['gettabwinvar(1, "b", "c", [])'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['gettabwinvar(1, 1, 3, {})'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
 enddef
 
 def Test_gettagstack()
-  v9.CheckDefAndScriptFailure(['gettagstack("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['gettagstack("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_gettext()
-  v9.CheckDefAndScriptFailure(['gettext(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['gettext("")'], 'E1175: Non-empty string required for argument 1')
+  v9.CheckSourceDefAndScriptFailure(['gettext(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['gettext("")'], 'E1175: Non-empty string required for argument 1')
   assert_equal('abc', gettext("abc"))
   assert_fails('gettext("")', 'E1175:')
 enddef
 
 def Test_getwininfo()
-  v9.CheckDefAndScriptFailure(['getwininfo("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getwininfo("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_getwinpos()
   assert_equal(['x', 'x'], getwinpos()->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getwinpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getwinpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_getwinvar()
-  v9.CheckDefAndScriptFailure(['getwinvar("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['getwinvar(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['getwinvar("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getwinvar(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_glob()
   glob('runtest.vim', true, true, true)->assert_equal(['runtest.vim'])
-  v9.CheckDefAndScriptFailure(['glob(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['glob("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['glob("a", 1, "b")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['glob("a", 1, true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['glob(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['glob("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['glob("a", 1, "b")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['glob("a", 1, true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   glob('')->assert_equal('')
 enddef
 
 def Test_glob2regpat()
-  v9.CheckDefAndScriptFailure(['glob2regpat(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['glob2regpat(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1174: String required for argument 1'])
   glob2regpat('')->assert_equal('^$')
 enddef
 
 def Test_globpath()
   globpath('.', 'runtest.vim', true, true, true)->assert_equal(['./runtest.vim'])
-  v9.CheckDefAndScriptFailure(['globpath(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['globpath("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['globpath("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['globpath("a", "b", true, "d")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
-  v9.CheckDefAndScriptFailure(['globpath("a", "b", true, false, "e")'], ['E1013: Argument 5: type mismatch, expected bool but got string', 'E1212: Bool required for argument 5'])
+  v9.CheckSourceDefAndScriptFailure(['globpath(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['globpath("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['globpath("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['globpath("a", "b", true, "d")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['globpath("a", "b", true, false, "e")'], ['E1013: Argument 5: type mismatch, expected bool but got string', 'E1212: Bool required for argument 5'])
   globpath('', '')->assert_equal('')
 enddef
 
 def Test_has()
   has('eval', true)->assert_equal(1)
-  v9.CheckDefAndScriptFailure(['has(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['has("a", "b")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['has(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['has("a", "b")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
   has('')->assert_equal(0)
 enddef
 
@@ -2098,14 +2098,14 @@
   assert_false(has_key(d, 'x'))
   assert_false(has_key(d, 99))
 
-  v9.CheckDefAndScriptFailure(['has_key([1, 2], "k")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['has_key({"a": 10}, ["a"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['has_key([1, 2], "k")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['has_key({"a": 10}, ["a"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 2'])
 enddef
 
 def Test_haslocaldir()
-  v9.CheckDefAndScriptFailure(['haslocaldir("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['haslocaldir("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['haslocaldir(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['haslocaldir("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['haslocaldir("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['haslocaldir(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_hasmapto()
@@ -2113,81 +2113,81 @@
   iabbrev foo foobar
   hasmapto('foobar', 'i', true)->assert_equal(1)
   iunabbrev foo
-  v9.CheckDefAndScriptFailure(['hasmapto(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['hasmapto("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['hasmapto("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['hasmapto(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['hasmapto("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['hasmapto("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
   hasmapto('', '')->assert_equal(0)
 enddef
 
 def Test_histadd()
-  v9.CheckDefAndScriptFailure(['histadd(1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['histadd(":", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['histadd(1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['histadd(":", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   histadd("search", 'skyblue')
   assert_equal('skyblue', histget('/', -1))
   histadd("search", '')->assert_equal(0)
 enddef
 
 def Test_histdel()
-  v9.CheckDefAndScriptFailure(['histdel(1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['histdel(":", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['histdel(1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['histdel(":", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
   histdel('search', '')->assert_equal(0)
 enddef
 
 def Test_histget()
-  v9.CheckDefAndScriptFailure(['histget(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['histget("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['histget(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['histget("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_histnr()
-  v9.CheckDefAndScriptFailure(['histnr(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['histnr(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal(-1, histnr('abc'))
 enddef
 
 def Test_hlID()
-  v9.CheckDefAndScriptFailure(['hlID(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['hlID(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal(0, hlID('NonExistingHighlight'))
   hlID('')->assert_equal(0)
 enddef
 
 def Test_hlexists()
-  v9.CheckDefAndScriptFailure(['hlexists([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['hlexists([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
   assert_equal(0, hlexists('NonExistingHighlight'))
   hlexists('')->assert_equal(0)
 enddef
 
 def Test_hlget()
-  v9.CheckDefAndScriptFailure(['hlget([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['hlget([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
   hlget('')->assert_equal([])
 enddef
 
 def Test_hlset()
-  v9.CheckDefAndScriptFailure(['hlset("id")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['hlset("id")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
   hlset([])->assert_equal(0)
 enddef
 
 def Test_iconv()
-  v9.CheckDefAndScriptFailure(['iconv(1, "from", "to")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['iconv("abc", 10, "to")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['iconv("abc", "from", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['iconv(1, "from", "to")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['iconv("abc", 10, "to")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['iconv("abc", "from", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   assert_equal('abc', iconv('abc', 'fromenc', 'toenc'))
   iconv('', '', '')->assert_equal('')
 enddef
 
 def Test_indent()
-  v9.CheckDefAndScriptFailure(['indent([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['indent(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['indent("")'], 'E1209: Invalid value for a line number')
-  v9.CheckDefExecAndScriptFailure(['indent(-1)'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefAndScriptFailure(['indent([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['indent(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['indent("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(['indent(-1)'], 'E966: Invalid line number: -1')
   assert_equal(0, indent(1))
 enddef
 
 def Test_index()
   index(['a', 'b', 'a', 'B'], 'b', 2, true)->assert_equal(3)
-  v9.CheckDefAndScriptFailure(['index("a", "a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1226: List or Blob required for argument 1'])
-  v9.CheckDefFailure(['index(["1"], 1)'], 'E1013: Argument 2: type mismatch, expected string but got number')
-  v9.CheckDefAndScriptFailure(['index(0z10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['index([1], 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['index(0z1020, 10, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['index("a", "a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1226: List or Blob required for argument 1'])
+  v9.CheckSourceDefFailure(['index(["1"], 1)'], 'E1013: Argument 2: type mismatch, expected string but got number')
+  v9.CheckSourceDefAndScriptFailure(['index(0z10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['index([1], 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['index(0z1020, 10, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
 enddef
 
 def Test_indexof()
@@ -2210,7 +2210,7 @@
 
     indexof([{color: "red"}], TestIdx)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E176: Invalid number of arguments', 'E118: Too many arguments for function'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E176: Invalid number of arguments', 'E118: Too many arguments for function'])
 
   lines =<< trim END
     def TestIdx(k: number, v: dict<any>)
@@ -2218,7 +2218,7 @@
 
     indexof([{color: "red"}], TestIdx)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool', 'E1031: Cannot use void value'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool', 'E1031: Cannot use void value'])
 
   lines =<< trim END
     def TestIdx(k: number, v: dict<any>): string
@@ -2227,35 +2227,35 @@
 
     indexof([{color: "red"}], TestIdx)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool', 'E1135: Using a String as a Bool'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?any): bool', 'E1135: Using a String as a Bool'])
 enddef
 
 def Test_input()
-  v9.CheckDefAndScriptFailure(['input(5)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['input(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['input("p", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['input("p", "q", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['input(5)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['input(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['input("p", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['input("p", "q", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
 enddef
 
 def Test_inputdialog()
-  v9.CheckDefAndScriptFailure(['inputdialog(5)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['inputdialog(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['inputdialog("p", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['inputdialog("p", "q", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['inputdialog(5)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['inputdialog(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['inputdialog("p", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['inputdialog("p", "q", 20)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
 enddef
 
 def Test_inputlist()
-  v9.CheckDefAndScriptFailure(['inputlist(10)'], ['E1013: Argument 1: type mismatch, expected list<string> but got number', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['inputlist("abc")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['inputlist([1, 2, 3])'], 'E1013: Argument 1: type mismatch, expected list<string> but got list<number>')
+  v9.CheckSourceDefAndScriptFailure(['inputlist(10)'], ['E1013: Argument 1: type mismatch, expected list<string> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['inputlist("abc")'], ['E1013: Argument 1: type mismatch, expected list<string> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['inputlist([1, 2, 3])'], 'E1013: Argument 1: type mismatch, expected list<string> but got list<number>')
   feedkeys("2\<CR>", 't')
   var r: number = inputlist(['a', 'b', 'c'])
   assert_equal(2, r)
 enddef
 
 def Test_inputsecret()
-  v9.CheckDefAndScriptFailure(['inputsecret(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['inputsecret("Pass:", 20)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['inputsecret(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['inputsecret("Pass:", 20)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   feedkeys("\<CR>", 't')
   var ans: string = inputsecret('Pass:', '123')
   assert_equal('123', ans)
@@ -2282,12 +2282,12 @@
   var lines =<< trim END
       insert(test_null_list(), 123)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1130:', 1)
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1130:', 1)
 
   lines =<< trim END
       insert(test_null_blob(), 123)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1131:', 1)
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1131:', 1)
 
   assert_equal([1, 2, 3], insert([2, 3], 1))
   assert_equal([1, 2, 3], insert([2, 3], number_one))
@@ -2296,9 +2296,9 @@
   assert_equal(['a', 'b', 'c'], insert(['b', 'c'], 'a'))
   assert_equal(0z1234, insert(0z34, 0x12))
 
-  v9.CheckDefAndScriptFailure(['insert("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1226: List or Blob required for argument 1'])
-  v9.CheckDefFailure(['insert([2, 3], "a")'], 'E1013: Argument 2: type mismatch, expected number but got string')
-  v9.CheckDefAndScriptFailure(['insert([2, 3], 1, "x")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['insert("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1226: List or Blob required for argument 1'])
+  v9.CheckSourceDefFailure(['insert([2, 3], "a")'], 'E1013: Argument 2: type mismatch, expected number but got string')
+  v9.CheckSourceDefAndScriptFailure(['insert([2, 3], 1, "x")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 enddef
 
 def Test_instanceof()
@@ -2308,7 +2308,7 @@
     endclass
     instanceof('hello', Foo)
   END
-  v9.CheckScriptFailure(lines, 'E616: Object required for argument 1')
+  v9.CheckSourceScriptFailure(lines, 'E616: Object required for argument 1')
 
   lines =<< trim END
     vim9script
@@ -2316,7 +2316,7 @@
     endclass
     instanceof(Foo.new(), 123)
   END
-  v9.CheckScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
+  v9.CheckSourceScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
 
   lines =<< trim END
     vim9script
@@ -2327,7 +2327,7 @@
     enddef
     Bar()
   END
-  v9.CheckScriptFailure(lines, 'E1013: Argument 1: type mismatch, expected object<Unknown> but got string')
+  v9.CheckSourceScriptFailure(lines, 'E1013: Argument 1: type mismatch, expected object<Unknown> but got string')
 
   lines =<< trim END
     vim9script
@@ -2338,7 +2338,7 @@
     enddef
     Bar()
   END
-  v9.CheckScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
+  v9.CheckSourceScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
 
   lines =<< trim END
     vim9script
@@ -2346,7 +2346,7 @@
     endclass
     instanceof(Foo.new(), [{}])
   END
-  v9.CheckSourceFailure(lines, 'E693: Class or class typealias required for argument 2')
+  v9.CheckSourceScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
 
   lines =<< trim END
     vim9script
@@ -2357,22 +2357,22 @@
     enddef
     Bar()
   END
-  v9.CheckSourceFailure(lines, 'E693: Class or class typealias required for argument 2')
+  v9.CheckSourceScriptFailure(lines, 'E693: Class or class typealias required for argument 2')
 enddef
 
 def Test_invert()
-  v9.CheckDefAndScriptFailure(['invert("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['invert("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_isdirectory()
-  v9.CheckDefAndScriptFailure(['isdirectory(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['isdirectory(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1174: String required for argument 1'])
   assert_false(isdirectory('NonExistingDir'))
   assert_false(isdirectory(''))
 enddef
 
 def Test_islocked()
-  v9.CheckDefAndScriptFailure(['islocked(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['var n1: number = 10', 'islocked(n1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['islocked(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['var n1: number = 10', 'islocked(n1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   g:v1 = 10
   assert_false(islocked('g:v1'))
   lockvar g:v1
@@ -2382,7 +2382,7 @@
 enddef
 
 def Test_items()
-  v9.CheckDefFailure(['123->items()'], 'E1225:')
+  v9.CheckSourceDefFailure(['123->items()'], 'E1225:')
   assert_equal([['a', 10], ['b', 20]], {'a': 10, 'b': 20}->items())
   assert_equal([], {}->items())
   assert_equal(['x', 'x'], {'a': 10, 'b': 20}->items()->map((_, _) => 'x'))
@@ -2400,7 +2400,7 @@
   if !has('job')
     CheckFeature job
   else
-    v9.CheckDefAndScriptFailure(['job_getchannel("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['job_getchannel("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
     assert_fails('job_getchannel(test_null_job())', 'E916: Not a valid job')
   endif
 enddef
@@ -2409,7 +2409,7 @@
   if !has('job')
     CheckFeature job
   else
-    v9.CheckDefAndScriptFailure(['job_info("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['job_info("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
     assert_fails('job_info(test_null_job())', 'E916: Not a valid job')
   endif
 enddef
@@ -2420,8 +2420,8 @@
   if !has('job')
     CheckFeature job
   else
-    v9.CheckDefAndScriptFailure(['job_setoptions(test_null_channel(), {})'], ['E1013: Argument 1: type mismatch, expected job but got channel', 'E1218: Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['job_setoptions(test_null_job(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['job_setoptions(test_null_channel(), {})'], ['E1013: Argument 1: type mismatch, expected job but got channel', 'E1218: Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['job_setoptions(test_null_job(), [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
     assert_equal('fail', job_status(test_null_job()))
   endif
 enddef
@@ -2430,7 +2430,7 @@
   if !has('job')
     CheckFeature job
   else
-    v9.CheckDefAndScriptFailure(['job_status("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['job_status("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
     assert_equal('fail', job_status(test_null_job()))
   endif
 enddef
@@ -2439,25 +2439,25 @@
   if !has('job')
     CheckFeature job
   else
-    v9.CheckDefAndScriptFailure(['job_stop("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
-    v9.CheckDefAndScriptFailure(['job_stop(test_null_job(), true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['job_stop("a")'], ['E1013: Argument 1: type mismatch, expected job but got string', 'E1218: Job required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['job_stop(test_null_job(), true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
   endif
 enddef
 
 def Test_join()
-  v9.CheckDefAndScriptFailure(['join("abc")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['join([], 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['join("abc")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['join([], 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   join([''], '')->assert_equal('')
 enddef
 
 def Test_js_decode()
-  v9.CheckDefAndScriptFailure(['js_decode(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['js_decode(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal([1, 2], js_decode('[1,2]'))
   js_decode('')->assert_equal(v:none)
 enddef
 
 def Test_json_decode()
-  v9.CheckDefAndScriptFailure(['json_decode(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['json_decode(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1174: String required for argument 1'])
   assert_equal(1.0, json_decode('1.0'))
   json_decode('')->assert_equal(v:none)
 enddef
@@ -2465,7 +2465,7 @@
 def Test_keys()
   assert_equal([7, 7], keys({a: 1, b: 2})->map((_, _) => 7))
 
-  v9.CheckDefAndScriptFailure(['keys([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['keys([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
   assert_equal(['a'], {a: 'v'}->keys())
   assert_equal([], {}->keys())
 enddef
@@ -2476,7 +2476,7 @@
 enddef
 
 def Test_len()
-  v9.CheckDefAndScriptFailure(['len(true)'], ['E1013: Argument 1: type mismatch, expected list<any> but got bool', 'E701: Invalid type for len()'])
+  v9.CheckSourceDefAndScriptFailure(['len(true)'], ['E1013: Argument 1: type mismatch, expected list<any> but got bool', 'E701: Invalid type for len()'])
   assert_equal(2, "ab"->len())
   assert_equal(3, 456->len())
   assert_equal(0, []->len())
@@ -2486,42 +2486,42 @@
 
 def Test_libcall()
   CheckFeature libcall
-  v9.CheckDefAndScriptFailure(['libcall(1, "b", 3)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['libcall("a", 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['libcall("a", "b", 1.1)'], ['E1013: Argument 3: type mismatch, expected string but got float', 'E1220: String or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['libcall(1, "b", 3)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['libcall("a", 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['libcall("a", "b", 1.1)'], ['E1013: Argument 3: type mismatch, expected string but got float', 'E1220: String or Number required for argument 3'])
 enddef
 
 def Test_libcallnr()
   CheckFeature libcall
-  v9.CheckDefAndScriptFailure(['libcallnr(1, "b", 3)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['libcallnr("a", 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['libcallnr("a", "b", 1.1)'], ['E1013: Argument 3: type mismatch, expected string but got float', 'E1220: String or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['libcallnr(1, "b", 3)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['libcallnr("a", 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['libcallnr("a", "b", 1.1)'], ['E1013: Argument 3: type mismatch, expected string but got float', 'E1220: String or Number required for argument 3'])
 enddef
 
 def Test_line()
   assert_fails('line(true)', 'E1174:')
-  v9.CheckDefAndScriptFailure(['line(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['line(".", "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['line("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['line(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['line(".", "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['line("")'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_line2byte()
-  v9.CheckDefAndScriptFailure(['line2byte(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['line2byte("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['line2byte(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['line2byte("")'], 'E1209: Invalid value for a line number')
   assert_equal(-1, line2byte(1))
   assert_equal(-1, line2byte(10000))
 enddef
 
 def Test_lispindent()
-  v9.CheckDefAndScriptFailure(['lispindent({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['lispindent("")'], 'E1209: Invalid value for a line number')
-  v9.CheckDefExecAndScriptFailure(['lispindent(-1)'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefAndScriptFailure(['lispindent({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['lispindent("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(['lispindent(-1)'], 'E966: Invalid line number: -1')
   assert_equal(0, lispindent(1))
 enddef
 
 def Test_list2blob()
-  v9.CheckDefAndScriptFailure(['list2blob(10)'], ['E1013: Argument 1: type mismatch, expected list<number> but got number', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['list2blob([0z10, 0z02])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<blob>')
+  v9.CheckSourceDefAndScriptFailure(['list2blob(10)'], ['E1013: Argument 1: type mismatch, expected list<number> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['list2blob([0z10, 0z02])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<blob>')
 enddef
 
 def Test_list2str_str2list_utf8()
@@ -2532,8 +2532,8 @@
 enddef
 
 def Test_list2str()
-  v9.CheckDefAndScriptFailure(['list2str(".", true)'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['list2str([1], 0z10)'], ['E1013: Argument 2: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['list2str(".", true)'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['list2str([1], 0z10)'], ['E1013: Argument 2: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 2'])
 enddef
 
 def s:SID(): number
@@ -2543,22 +2543,22 @@
 enddef
 
 def Test_listener_add()
-  v9.CheckDefAndScriptFailure(['listener_add("1", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['listener_add("1", true)'], ['E1013: Argument 2: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 2'])
 enddef
 
 def Test_listener_flush()
-  v9.CheckDefAndScriptFailure(['listener_flush([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['listener_flush([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_listener_remove()
-  v9.CheckDefAndScriptFailure(['listener_remove("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['listener_remove("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_luaeval()
   if !has('lua')
     CheckFeature lua
   endif
-  v9.CheckDefAndScriptFailure(['luaeval(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['luaeval(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   if exists_compiled('*luaeval')
     luaeval('')->assert_equal(v:null)
   endif
@@ -2566,10 +2566,10 @@
 
 def Test_map()
   if has('channel')
-    v9.CheckDefAndScriptFailure(['map(test_null_channel(), "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got channel', 'E1251: List, Dictionary, Blob or String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['map(test_null_channel(), "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got channel', 'E1251: List, Dictionary, Blob or String required for argument 1'])
   endif
-  v9.CheckDefAndScriptFailure(['map(1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1251: List, Dictionary, Blob or String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['map([1, 2], 4)'], ['E1256: String or function required for argument 2', 'E1024: Using a Number as a String'])
+  v9.CheckSourceDefAndScriptFailure(['map(1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1251: List, Dictionary, Blob or String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['map([1, 2], 4)'], ['E1256: String or function required for argument 2', 'E1024: Using a Number as a String'])
 
   # type of dict remains dict<any> even when type of values changes
   # same for list
@@ -2599,7 +2599,7 @@
       assert_equal({a: 'x'}, {a: [1, 2]}->map((_, v) => 'x'))
       assert_equal({a: 'x'}, {a: {b: 2}}->map((_, v) => 'x'))
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 enddef
 
 def Test_map_failure()
@@ -2627,7 +2627,7 @@
       g:gd = d
       map(g:gd, (k, v) => true)
   END
-  v9.CheckDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected number but got bool')
+  v9.CheckSourceDefExecAndScriptFailure(lines, 'E1012: Type mismatch; expected number but got bool')
 enddef
 
 def Test_map_const()
@@ -2635,13 +2635,13 @@
       const l = [1, 2, 3]
       map(l, 'SomeFunc')
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       const d = {a: 1, b: 2}
       map(d, 'SomeFunc')
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
 enddef
 
 def Test_map_function_arg()
@@ -2653,16 +2653,16 @@
       map(l, MapOne)
       assert_equal(['0:a', '1:b', '2:c'], l)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
       range(3)->map((a, b, c) => a + b + c)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E176:', 'E1190: One argument too few'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E176:', 'E1190: One argument too few'])
   lines =<< trim END
       range(3)->map((a, b, c, d) => a + b + c + d)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E176:', 'E1190: 2 arguments too few'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E176:', 'E1190: 2 arguments too few'])
 
   # declared list cannot change type
   lines =<< trim END
@@ -2672,7 +2672,7 @@
     var ll: list<number> = [1, 2, 3]
     echo map(ll, Map)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, number): string', 'E1012: Type mismatch; expected number but got string'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, number): string', 'E1012: Type mismatch; expected number but got string'])
 
   # not declared list can change type
   echo [1, 2, 3]->map((..._) => 'x')
@@ -2684,25 +2684,25 @@
       map(l, (k, v) => k .. '/' .. v )
       assert_equal(['0/a', '1/b', '2/c'], l)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
     var l: list<number> = [0]
     echo map(l, (_, v) => [])
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
 
   lines =<< trim END
     var l: list<number> = range(2)
     echo map(l, (_, v) => [])
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
 
   lines =<< trim END
     var d: dict<number> = {key: 0}
     echo map(d, (_, v) => [])
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(any, any): list<any>', 'E1012: Type mismatch; expected number but got list<any>'], 2)
 enddef
 
 def Test_maparg()
@@ -2725,10 +2725,10 @@
         abbr: 0,
         mode_bits: 0x47})
   unmap foo
-  v9.CheckDefAndScriptFailure(['maparg(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['maparg("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['maparg("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['maparg("a", "b", true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['maparg(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['maparg("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['maparg("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['maparg("a", "b", true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   maparg('')->assert_equal('')
 
   # value argument type is checked at compile time
@@ -2736,46 +2736,46 @@
       var l = [123]
       l->map((i: number, v: string) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
 
   lines =<< trim END
       var d = {a: 123}
       d->map((i: string, v: string) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(string, string): number')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(string, string): number')
 
   lines =<< trim END
     var s = 'abc'
     s->map((i: number, v: number) => 'x')
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(number, number): string')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(number, number): string')
 
   lines =<< trim END
     var s = 0z1122
     s->map((i: number, v: string) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
 
   # index argument type is checked at compile time
   lines =<< trim END
       ['x']->map((i: string, v: string) => 'y')
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?any): any but got func(string, string): string')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?any): any but got func(string, string): string')
 
   lines =<< trim END
     {a: 1}->map((i: number, v: number) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?any): any but got func(number, number): number')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?any): any but got func(number, number): number')
 
   lines =<< trim END
     'abc'->map((i: string, v: string) => 'x')
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(string, string): string')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(string, string): string')
 
   lines =<< trim END
     0z1122->map((i: string, v: number) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number')
+  v9.CheckSourceDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number')
 enddef
 
 def Test_maparg_mapset()
@@ -2790,31 +2790,31 @@
   iabbrev foo foobar
   mapcheck('foo', 'i', true)->assert_equal('foobar')
   iunabbrev foo
-  v9.CheckDefAndScriptFailure(['mapcheck(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['mapcheck("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['mapcheck("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['mapcheck(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mapcheck("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['mapcheck("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
   mapcheck('')->assert_equal('')
   mapcheck('', '')->assert_equal('')
 enddef
 
 def Test_mapnew()
   if has('channel')
-    v9.CheckDefAndScriptFailure(['mapnew(test_null_job(), "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got job', 'E1251: List, Dictionary, Blob or String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['mapnew(test_null_job(), "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got job', 'E1251: List, Dictionary, Blob or String required for argument 1'])
   endif
-  v9.CheckDefAndScriptFailure(['mapnew(1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1251: List, Dictionary, Blob or String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mapnew(1, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1251: List, Dictionary, Blob or String required for argument 1'])
 enddef
 
 def Test_mapset()
-  v9.CheckDefAndScriptFailure(['mapset(1, true, {})'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1223: String or Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['mapset("a", 2, {})'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['mapset("a", false, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['mapset(1, true, {})'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1223: String or Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mapset("a", 2, {})'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['mapset("a", false, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_match()
-  v9.CheckDefAndScriptFailure(['match(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['match(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['match("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['match("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['match(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['match(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['match("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['match("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   assert_equal(2, match('ab12cd', '12'))
   assert_equal(-1, match('ab12cd', '34'))
   assert_equal(6, match('ab12cd12ef', '12', 4))
@@ -2829,39 +2829,39 @@
 enddef
 
 def Test_matchadd()
-  v9.CheckDefAndScriptFailure(['matchadd(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchadd("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchadd("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchadd("a", "b", 1, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
-  v9.CheckDefAndScriptFailure(['matchadd("a", "b", 1, 1, [])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 5'])
+  v9.CheckSourceDefAndScriptFailure(['matchadd(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchadd("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchadd("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchadd("a", "b", 1, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchadd("a", "b", 1, 1, [])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 5'])
   matchadd('', 'a')->assert_equal(-1)
   matchadd('Search', '')->assert_equal(-1)
 enddef
 
 def Test_matchaddpos()
-  v9.CheckDefAndScriptFailure(['matchaddpos(1, [1])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchaddpos("a", "b")'], ['E1013: Argument 2: type mismatch, expected list<any> but got string', 'E1211: List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchaddpos("a", [1], "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchaddpos("a", [1], 1, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
-  v9.CheckDefAndScriptFailure(['matchaddpos("a", [1], 1, 1, [])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 5'])
+  v9.CheckSourceDefAndScriptFailure(['matchaddpos(1, [1])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchaddpos("a", "b")'], ['E1013: Argument 2: type mismatch, expected list<any> but got string', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchaddpos("a", [1], "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchaddpos("a", [1], 1, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchaddpos("a", [1], 1, 1, [])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 5'])
   matchaddpos('', [1])->assert_equal(-1)
 enddef
 
 def Test_matcharg()
-  v9.CheckDefAndScriptFailure(['matcharg("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matcharg("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_matchdelete()
-  v9.CheckDefAndScriptFailure(['matchdelete("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchdelete("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchdelete(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchdelete("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchdelete("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchdelete(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_matchend()
-  v9.CheckDefAndScriptFailure(['matchend(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchend(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchend("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchend("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchend(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchend(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchend("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchend("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   assert_equal(4, matchend('ab12cd', '12'))
   assert_equal(-1, matchend('ab12cd', '34'))
   assert_equal(8, matchend('ab12cd12ef', '12', 4))
@@ -2876,9 +2876,9 @@
 enddef
 
 def Test_matchfuzzy()
-  v9.CheckDefAndScriptFailure(['matchfuzzy({}, "p")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchfuzzy([], 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchfuzzy([], "a", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzy({}, "p")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzy([], 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzy([], "a", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   matchfuzzy(['abc', 'xyz'], '')->assert_equal([])
   var lines =<< trim END
     var items = [{name: 'xyz', id: 1}, {name: 'def', id: 2},
@@ -2888,13 +2888,13 @@
     var k: list<string> = matchfuzzy(['one', 'two', 'who'], 'o')
     assert_equal(['one', 'two', 'who'], k)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 enddef
 
 def Test_matchfuzzypos()
-  v9.CheckDefAndScriptFailure(['matchfuzzypos({}, "p")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchfuzzypos([], 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchfuzzypos([], "a", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzypos({}, "p")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzypos([], 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchfuzzypos([], "a", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
   matchfuzzypos(['abc', 'xyz'], '')->assert_equal([[], [], []])
   var lines =<< trim END
     var items = [{name: 'xyz', id: 1}, {name: 'def', id: 2},
@@ -2904,14 +2904,14 @@
     var k: list<string> = matchfuzzypos(['one', 'two', 'who'], 'o')[0]
     assert_equal(['one', 'two', 'who'], k)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 enddef
 
 def Test_matchlist()
-  v9.CheckDefAndScriptFailure(['matchlist(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchlist(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchlist("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchlist("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchlist(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchlist(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchlist("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchlist("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   var l: list<string> = ['12',  '', '', '', '', '', '', '', '', '']
   assert_equal(l, matchlist('ab12cd', '12'))
   assert_equal([], matchlist('ab12cd', '34'))
@@ -2929,10 +2929,10 @@
 enddef
 
 def Test_matchstr()
-  v9.CheckDefAndScriptFailure(['matchstr(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchstr(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchstr("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchstr("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchstr(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchstr(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchstr("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchstr("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   assert_equal('12', matchstr('ab12cd', '12'))
   assert_equal('', matchstr('ab12cd', '34'))
   assert_equal('12', matchstr('ab12cd12ef', '12', 4))
@@ -2947,10 +2947,10 @@
 enddef
 
 def Test_matchstrpos()
-  v9.CheckDefAndScriptFailure(['matchstrpos(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['matchstrpos(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['matchstrpos("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['matchstrpos("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['matchstrpos(0z12, "p")'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['matchstrpos(["s"], [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['matchstrpos("s", "p", "q")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['matchstrpos("s", "p", 1, "r")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   assert_equal(['12', 2, 4], matchstrpos('ab12cd', '12'))
   assert_equal(['', -1, -1], matchstrpos('ab12cd', '34'))
   assert_equal(['12', 6, 8], matchstrpos('ab12cd12ef', '12', 4))
@@ -2978,13 +2978,13 @@
           ? [1, max([2, 3])]
           : [4, 5]
   assert_equal([4, 5], l2)
-  v9.CheckDefAndScriptFailure(['max(5)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1227: List or Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['max(5)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1227: List or Dictionary required for argument 1'])
 enddef
 
 def Test_menu_info()
-  v9.CheckDefAndScriptFailure(['menu_info(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['menu_info(10, "n")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['menu_info("File", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['menu_info(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['menu_info(10, "n")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['menu_info("File", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   assert_equal({}, menu_info('aMenu'))
 enddef
 
@@ -3000,49 +3000,49 @@
           ? [1, min([2, 3])]
           : [4, 5]
   assert_equal([4, 5], l2)
-  v9.CheckDefAndScriptFailure(['min(5)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1227: List or Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['min(5)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1227: List or Dictionary required for argument 1'])
 enddef
 
 def Test_mkdir()
-  v9.CheckDefAndScriptFailure(['mkdir(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['mkdir("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['mkdir("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['mkdir("")'], 'E1175: Non-empty string required for argument 1')
+  v9.CheckSourceDefAndScriptFailure(['mkdir(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mkdir("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['mkdir("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['mkdir("")'], 'E1175: Non-empty string required for argument 1')
   delete('a', 'rf')
 enddef
 
 def Test_mode()
-  v9.CheckDefAndScriptFailure(['mode("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['mode(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mode("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mode(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_mzeval()
   if !has('mzscheme')
     CheckFeature mzscheme
   endif
-  v9.CheckDefAndScriptFailure(['mzeval(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['mzeval(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_nextnonblank()
-  v9.CheckDefAndScriptFailure(['nextnonblank(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['nextnonblank("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['nextnonblank(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['nextnonblank("")'], 'E1209: Invalid value for a line number')
   assert_equal(0, nextnonblank(1))
 enddef
 
 def Test_nr2char()
   nr2char(97, true)->assert_equal('a')
-  v9.CheckDefAndScriptFailure(['nr2char("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['nr2char(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['nr2char("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['nr2char(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_or()
-  v9.CheckDefAndScriptFailure(['or("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['or(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['or("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['or(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_pathshorten()
-  v9.CheckDefAndScriptFailure(['pathshorten(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['pathshorten("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['pathshorten(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['pathshorten("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
   pathshorten('')->assert_equal('')
 enddef
 
@@ -3050,12 +3050,12 @@
   if !has('perl')
     CheckFeature perl
   endif
-  v9.CheckDefAndScriptFailure(['perleval(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['perleval(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_popup_atcursor()
-  v9.CheckDefAndScriptFailure(['popup_atcursor({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_atcursor("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_atcursor({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_atcursor("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
 
   # Pass variable of type 'any' to popup_atcursor()
   var what: any = 'Hello'
@@ -3065,17 +3065,17 @@
 enddef
 
 def Test_popup_beval()
-  v9.CheckDefAndScriptFailure(['popup_beval({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_beval("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_beval({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_beval("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_clear()
-  v9.CheckDefAndScriptFailure(['popup_clear(["a"])'], ['E1013: Argument 1: type mismatch, expected bool but got list<string>', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_clear(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_clear(["a"])'], ['E1013: Argument 1: type mismatch, expected bool but got list<string>', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_clear(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_popup_close()
-  v9.CheckDefAndScriptFailure(['popup_close("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_close("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_popup_create()
@@ -3087,81 +3087,81 @@
 enddef
 
 def Test_popup_dialog()
-  v9.CheckDefAndScriptFailure(['popup_dialog({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_dialog("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_dialog({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_dialog("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_filter_menu()
-  v9.CheckDefAndScriptFailure(['popup_filter_menu("x", "")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_filter_menu(1, 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_filter_menu("x", "")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_filter_menu(1, 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   var id: number = popup_menu(["one", "two", "three"], {})
   popup_filter_menu(id, '')
   popup_close(id)
 enddef
 
 def Test_popup_filter_yesno()
-  v9.CheckDefAndScriptFailure(['popup_filter_yesno("x", "")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_filter_yesno(1, 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_filter_yesno("x", "")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_filter_yesno(1, 1)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_popup_getoptions()
-  v9.CheckDefAndScriptFailure(['popup_getoptions("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_getoptions(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_getoptions("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_getoptions(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_popup_getpos()
-  v9.CheckDefAndScriptFailure(['popup_getpos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_getpos(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_getpos("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_getpos(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_popup_hide()
-  v9.CheckDefAndScriptFailure(['popup_hide("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_hide(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_hide("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_hide(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_popup_locate()
-  v9.CheckDefAndScriptFailure(['popup_locate("a", 20)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_locate(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_locate("a", 20)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_locate(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_popup_menu()
-  v9.CheckDefAndScriptFailure(['popup_menu({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_menu("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_menu({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_menu("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_move()
-  v9.CheckDefAndScriptFailure(['popup_move("x", {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_move(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_move("x", {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_move(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_notification()
-  v9.CheckDefAndScriptFailure(['popup_notification({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_notification("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_notification({"a": 10}, {})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_notification("a", [1, 2])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_setoptions()
-  v9.CheckDefAndScriptFailure(['popup_setoptions("x", {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_setoptions(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_setoptions("x", {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_setoptions(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_popup_settext()
-  v9.CheckDefAndScriptFailure(['popup_settext("x", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_settext(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1222: String or List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['popup_settext("x", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_settext(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1222: String or List required for argument 2'])
 enddef
 
 def Test_popup_show()
-  v9.CheckDefAndScriptFailure(['popup_show("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['popup_show(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_show("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['popup_show(true)'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_prevnonblank()
-  v9.CheckDefAndScriptFailure(['prevnonblank(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['prevnonblank("")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['prevnonblank(null)'], ['E1013: Argument 1: type mismatch, expected string but got special', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['prevnonblank("")'], 'E1209: Invalid value for a line number')
   assert_equal(0, prevnonblank(1))
 enddef
 
 def Test_printf()
-  v9.CheckDefAndScriptFailure(['printf([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['printf([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   printf(0x10)->assert_equal('16')
   assert_equal(" abc", "abc"->printf("%4s"))
 enddef
@@ -3170,7 +3170,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['prompt_getprompt([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['prompt_getprompt([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
     assert_equal('', prompt_getprompt('NonExistingBuf'))
   endif
 enddef
@@ -3179,7 +3179,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['prompt_setcallback(true, "1")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['prompt_setcallback(true, "1")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
   endif
 enddef
 
@@ -3187,7 +3187,7 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['prompt_setinterrupt(true, "1")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['prompt_setinterrupt(true, "1")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
   endif
 enddef
 
@@ -3195,109 +3195,109 @@
   if !has('channel')
     CheckFeature channel
   else
-    v9.CheckDefAndScriptFailure(['prompt_setprompt([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-    v9.CheckDefAndScriptFailure(['prompt_setprompt(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['prompt_setprompt([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['prompt_setprompt(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
   endif
 enddef
 
 def Test_prop_add()
-  v9.CheckDefAndScriptFailure(['prop_add("a", 2, {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_add(1, "b", {})'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['prop_add(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['prop_add("a", 2, {})'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_add(1, "b", {})'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_add(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_prop_add_list()
-  v9.CheckDefAndScriptFailure(['prop_add_list([], [])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_add_list({}, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_add_list([], [])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_add_list({}, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
 enddef
 
 def Test_prop_clear()
-  v9.CheckDefAndScriptFailure(['prop_clear("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_clear(1, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['prop_clear(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['prop_clear("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_clear(1, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_clear(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_prop_find()
-  v9.CheckDefAndScriptFailure(['prop_find([1, 2])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_find([1, 2], "k")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_find({"a": 10}, ["a"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_find([1, 2])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_find([1, 2], "k")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_find({"a": 10}, ["a"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1174: String required for argument 2'])
   assert_fails("prop_find({}, '')", 'E474:')
 enddef
 
 def Test_prop_list()
-  v9.CheckDefAndScriptFailure(['prop_list("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_list(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_list("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_list(1, [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_prop_remove()
-  v9.CheckDefAndScriptFailure(['prop_remove([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_remove({}, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['prop_remove({}, 1, "b")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['prop_remove([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_remove({}, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_remove({}, 1, "b")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 enddef
 
 def Test_prop_type_add()
-  v9.CheckDefAndScriptFailure(['prop_type_add({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_add("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_add({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_add("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
   assert_fails("prop_type_add('', {highlight: 'Search'})", 'E475:')
 enddef
 
 def Test_prop_type_change()
-  v9.CheckDefAndScriptFailure(['prop_type_change({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_change("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_change({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_change("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
   assert_fails("prop_type_change('', {highlight: 'Search'})", 'E475:')
 enddef
 
 def Test_prop_type_delete()
-  v9.CheckDefAndScriptFailure(['prop_type_delete({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_delete({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_delete("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_delete({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_delete({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_delete("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
   assert_fails("prop_type_delete('')", 'E475:')
 enddef
 
 def Test_prop_type_get()
-  v9.CheckDefAndScriptFailure(['prop_type_get({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_get({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_get("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_get({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_get({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_get("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
   assert_fails("prop_type_get('')", 'E475:')
 enddef
 
 def Test_prop_type_list()
-  v9.CheckDefAndScriptFailure(['prop_type_list(["a"])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['prop_type_list(2)'], ['E1013: Argument 1: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_list(["a"])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['prop_type_list(2)'], ['E1013: Argument 1: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 1'])
 enddef
 
 def Test_py3eval()
   if !has('python3')
     CheckFeature python3
   endif
-  v9.CheckDefAndScriptFailure(['py3eval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['py3eval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_pyeval()
   if !has('python')
     CheckFeature python
   endif
-  v9.CheckDefAndScriptFailure(['pyeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['pyeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_pyxeval()
   if !has('python') && !has('python3')
     CheckFeature python
   endif
-  v9.CheckDefAndScriptFailure(['pyxeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['pyxeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_rand()
-  v9.CheckDefAndScriptFailure(['rand(10)'], ['E1013: Argument 1: type mismatch, expected list<number> but got number', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['rand(["a"])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<string>')
+  v9.CheckSourceDefAndScriptFailure(['rand(10)'], ['E1013: Argument 1: type mismatch, expected list<number> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['rand(["a"])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<string>')
   assert_true(rand() >= 0)
   assert_true(rand(srand()) >= 0)
 enddef
 
 def Test_range()
-  v9.CheckDefAndScriptFailure(['range("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['range(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['range(10, 20, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['range("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['range(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['range(10, 20, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 
   # returns a list<number> but it's not declared as such
   assert_equal(['x', 'x'], range(2)->map((i, v) => 'x'))
@@ -3306,8 +3306,8 @@
 def Test_readdir()
   eval expand('sautest')->readdir((e) => e[0] !=# '.')
   eval expand('sautest')->readdirex((e) => e.name[0] !=# '.')
-  v9.CheckDefAndScriptFailure(['readdir(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['readdir("a", "1", [3])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['readdir(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['readdir("a", "1", [3])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
   if has('unix')
     # only fails on Unix-like systems
     assert_fails('readdir("")', 'E484: Can''t open file')
@@ -3315,8 +3315,8 @@
 enddef
 
 def Test_readdirex()
-  v9.CheckDefAndScriptFailure(['readdirex(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['readdirex("a", "1", [3])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['readdirex(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['readdirex("a", "1", [3])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
   if has('unix')
     # only fails on Unix-like systems
     assert_fails('readdirex("")', 'E484: Can''t open file')
@@ -3332,8 +3332,8 @@
   var lines =<< trim END
       var read: list<string> = readblob('Xreadblob')
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1012: Type mismatch; expected list<string> but got blob', 1)
-  v9.CheckDefExecAndScriptFailure(['readblob("")'], 'E484: Can''t open file <empty>')
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1012: Type mismatch; expected list<string> but got blob', 1)
+  v9.CheckSourceDefExecAndScriptFailure(['readblob("")'], 'E484: Can''t open file <empty>')
 enddef
 
 def Test_readfile()
@@ -3346,15 +3346,15 @@
   var lines =<< trim END
       var read: dict<string> = readfile('Xreadfile')
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1012: Type mismatch; expected dict<string> but got list<string>', 1)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1012: Type mismatch; expected dict<string> but got list<string>', 1)
 
-  v9.CheckDefAndScriptFailure(['readfile("a", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['readfile("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['readfile("")'], 'E1175: Non-empty string required for argument 1')
+  v9.CheckSourceDefAndScriptFailure(['readfile("a", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['readfile("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['readfile("")'], 'E1175: Non-empty string required for argument 1')
 enddef
 
 def Test_reduce()
-  v9.CheckDefAndScriptFailure(['reduce({a: 10}, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1252: String, List or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['reduce({a: 10}, "1")'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1252: String, List or Blob required for argument 1'])
   assert_equal(6, [1, 2, 3]->reduce((r, c) => r + c, 0))
   assert_equal(11, 0z0506->reduce((r, c) => r + c, 0))
 enddef
@@ -3362,13 +3362,13 @@
 def Test_reltime()
   CheckFeature reltime
 
-  v9.CheckDefExecAndScriptFailure(['[]->reltime()'], 'E474:')
-  v9.CheckDefExecAndScriptFailure(['[]->reltime([])'], 'E474:')
+  v9.CheckSourceDefExecAndScriptFailure(['[]->reltime()'], 'E474:')
+  v9.CheckSourceDefExecAndScriptFailure(['[]->reltime([])'], 'E474:')
 
-  v9.CheckDefAndScriptFailure(['reltime("x")'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['reltime(["x", "y"])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<string>')
-  v9.CheckDefAndScriptFailure(['reltime([1, 2], 10)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefFailure(['reltime([1, 2], ["a", "b"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
+  v9.CheckSourceDefAndScriptFailure(['reltime("x")'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['reltime(["x", "y"])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<string>')
+  v9.CheckSourceDefAndScriptFailure(['reltime([1, 2], 10)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefFailure(['reltime([1, 2], ["a", "b"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
   var start: list<any> = reltime()
   assert_true(type(reltime(start)) == v:t_list)
   var end: list<any> = reltime()
@@ -3378,31 +3378,31 @@
 def Test_reltimefloat()
   CheckFeature reltime
 
-  v9.CheckDefExecAndScriptFailure(['[]->reltimefloat()'], 'E474:')
+  v9.CheckSourceDefExecAndScriptFailure(['[]->reltimefloat()'], 'E474:')
 
-  v9.CheckDefAndScriptFailure(['reltimefloat("x")'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['reltimefloat([1.1])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<float>')
+  v9.CheckSourceDefAndScriptFailure(['reltimefloat("x")'], ['E1013: Argument 1: type mismatch, expected list<number> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['reltimefloat([1.1])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<float>')
   assert_true(type(reltimefloat(reltime())) == v:t_float)
 enddef
 
 def Test_reltimestr()
   CheckFeature reltime
 
-  v9.CheckDefExecAndScriptFailure(['[]->reltimestr()'], 'E474:')
+  v9.CheckSourceDefExecAndScriptFailure(['[]->reltimestr()'], 'E474:')
 
-  v9.CheckDefAndScriptFailure(['reltimestr(true)'], ['E1013: Argument 1: type mismatch, expected list<number> but got bool', 'E1211: List required for argument 1'])
-  v9.CheckDefFailure(['reltimestr([true])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<bool>')
+  v9.CheckSourceDefAndScriptFailure(['reltimestr(true)'], ['E1013: Argument 1: type mismatch, expected list<number> but got bool', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefFailure(['reltimestr([true])'], 'E1013: Argument 1: type mismatch, expected list<number> but got list<bool>')
   assert_true(type(reltimestr(reltime())) == v:t_string)
 enddef
 
 def Test_remote_expr()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['remote_expr(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['remote_expr("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['remote_expr("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
-  v9.CheckDefAndScriptFailure(['remote_expr("a", "b", "c", "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
-  v9.CheckDefExecAndScriptFailure(['remote_expr("", "")'], 'E241: Unable to send to ')
+  v9.CheckSourceDefAndScriptFailure(['remote_expr(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_expr("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['remote_expr("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['remote_expr("a", "b", "c", "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefExecAndScriptFailure(['remote_expr("", "")'], 'E241: Unable to send to ')
 enddef
 
 def Test_remote_foreground()
@@ -3411,7 +3411,7 @@
   CheckNotMSWindows
   CheckX11
 
-  v9.CheckDefAndScriptFailure(['remote_foreground(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_foreground(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_fails('remote_foreground("NonExistingServer")', 'E241:')
   assert_fails('remote_foreground("")', 'E241:')
 enddef
@@ -3419,32 +3419,32 @@
 def Test_remote_peek()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['remote_peek(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['remote_peek("a5b6c7", [1])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['remote_peek("")'], 'E573: Invalid server id used')
+  v9.CheckSourceDefAndScriptFailure(['remote_peek(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_peek("a5b6c7", [1])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['remote_peek("")'], 'E573: Invalid server id used')
 enddef
 
 def Test_remote_read()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['remote_read(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['remote_read("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['remote_read("")'], 'E573: Invalid server id used')
+  v9.CheckSourceDefAndScriptFailure(['remote_read(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_read("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['remote_read("")'], 'E573: Invalid server id used')
 enddef
 
 def Test_remote_send()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['remote_send(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['remote_send("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['remote_send("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['remote_send(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_send("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['remote_send("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   assert_fails('remote_send("", "")', 'E241:')
 enddef
 
 def Test_remote_startserver()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['remote_startserver({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remote_startserver({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_remove_literal_list()
@@ -3458,28 +3458,28 @@
       const l = [1, 2, 3, 4]
       remove(l, 1)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       const d = {a: 1, b: 2}
       remove(d, 'a')
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const dict<number>')
 
   lines =<< trim END
       const b = 0z010203
       remove(b, 1)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
 enddef
 
 def Test_remove()
-  v9.CheckDefAndScriptFailure(['remove("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1228: List, Dictionary or Blob required for argument 1'])
-  v9.CheckDefAndScriptFailure(['remove([], "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['remove([], 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['remove({}, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['remove(0z10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['remove(0z20, 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['remove("a", 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1228: List, Dictionary or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['remove([], "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['remove([], 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['remove({}, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['remove(0z10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['remove(0z20, 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   var l: any = [1, 2, 3, 4]
   remove(l, 1)
   assert_equal([1, 3, 4], l)
@@ -3511,14 +3511,14 @@
 enddef
 
 def Test_rename()
-  v9.CheckDefAndScriptFailure(['rename(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['rename("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['rename(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['rename("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   rename('', '')->assert_equal(0)
 enddef
 
 def Test_repeat()
-  v9.CheckDefAndScriptFailure(['repeat(1.1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1301: String, Number, List or Blob required for argument 1'])
-  v9.CheckDefAndScriptFailure(['repeat({a: 10}, 2)'], ['E1013: Argument 1: type mismatch, expected string but got dict<', 'E1301: String, Number, List or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['repeat(1.1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1301: String, Number, List or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['repeat({a: 10}, 2)'], ['E1013: Argument 1: type mismatch, expected string but got dict<', 'E1301: String, Number, List or Blob required for argument 1'])
   var lines =<< trim END
       assert_equal('aaa', repeat('a', 3))
       assert_equal('111', repeat(1, 3))
@@ -3529,17 +3529,17 @@
       s ..= repeat(5, 3)
       assert_equal('-555', s)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 enddef
 
 def Test_resolve()
-  v9.CheckDefAndScriptFailure(['resolve([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['resolve([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
   assert_equal('SomeFile', resolve('SomeFile'))
   resolve('')->assert_equal('')
 enddef
 
 def Test_reverse()
-  v9.CheckDefAndScriptFailure(['reverse(10)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1252: String, List or Blob required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['reverse(10)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1252: String, List or Blob required for argument 1'])
 enddef
 
 def Test_reverse_return_type()
@@ -3556,49 +3556,49 @@
       const l = [1, 2, 3, 4]
       reverse(l)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 
   lines =<< trim END
       const b = 0z010203
       reverse(b)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const blob')
 enddef
 
 def Test_rubyeval()
   if !has('ruby')
     CheckFeature ruby
   endif
-  v9.CheckDefAndScriptFailure(['rubyeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['rubyeval([2])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_screenattr()
-  v9.CheckDefAndScriptFailure(['screenattr("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['screenattr(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['screenattr("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['screenattr(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_screenchar()
-  v9.CheckDefAndScriptFailure(['screenchar("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['screenchar(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['screenchar("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['screenchar(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_screenchars()
   assert_equal(['x'], screenchars(1, 1)->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['screenchars("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['screenchars(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['screenchars("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['screenchars(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_screenpos()
-  v9.CheckDefAndScriptFailure(['screenpos("a", 1, 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['screenpos(1, "b", 1)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['screenpos(1, 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['screenpos("a", 1, 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['screenpos(1, "b", 1)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['screenpos(1, 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   assert_equal({col: 1, row: 1, endcol: 1, curscol: 1}, screenpos(1, 1, 1))
 enddef
 
 def Test_screenstring()
-  v9.CheckDefAndScriptFailure(['screenstring("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['screenstring(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['screenstring("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['screenstring(1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_search()
@@ -3630,13 +3630,13 @@
   normal 0
   assert_equal([0, 0], searchpos('this', '', 0, 0, 'col(".") > col'))
   bwipe!
-  v9.CheckDefAndScriptFailure(['search(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['search("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['search("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['search("a", "b", 3, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['search(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['search("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['search("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['search("a", "b", 3, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   new
   setline(1, "match this")
-  v9.CheckDefAndScriptFailure(['search("a", "", 9, 0, [0])'], ['E1013: Argument 5: type mismatch, expected func(...): any but got list<number>', 'E730: Using a List as a String'])
+  v9.CheckSourceDefAndScriptFailure(['search("a", "", 9, 0, [0])'], ['E1013: Argument 5: type mismatch, expected func(...): any but got list<number>', 'E730: Using a List as a String'])
   bwipe!
 enddef
 
@@ -3652,14 +3652,14 @@
           maxcount: 99,
           incomplete: 0})
   bwipe!
-  v9.CheckDefAndScriptFailure(['searchcount([1])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['searchcount([1])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 1'])
 enddef
 
 def Test_searchdecl()
   searchdecl('blah', true, true)->assert_equal(1)
-  v9.CheckDefAndScriptFailure(['searchdecl(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['searchdecl("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['searchdecl("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['searchdecl(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['searchdecl("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['searchdecl("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
 
   # search for an empty string declaration
   var lines: list<string> =<< trim END
@@ -3719,7 +3719,7 @@
       enddef
       Fail()
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
   assert_equal('yes', g:caught)
   unlet g:caught
   bwipe!
@@ -3727,64 +3727,64 @@
   lines =<< trim END
       echo searchpair("a", "b", "c", "d", "f", 33)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1001: Variable not found: f', 'E475: Invalid argument: d'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1001: Variable not found: f', 'E475: Invalid argument: d'])
 
   var errors = ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1']
-  v9.CheckDefAndScriptFailure(['searchpair(1, "b", "c")'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos(1, "b", "c")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair(1, "b", "c")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos(1, "b", "c")'], errors)
 
   errors = ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2']
-  v9.CheckDefAndScriptFailure(['searchpair("a", 2, "c")'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos("a", 2, "c")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", 2, "c")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos("a", 2, "c")'], errors)
 
   errors = ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3']
-  v9.CheckDefAndScriptFailure(['searchpair("a", "b", 3)'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos("a", "b", 3)'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", "b", 3)'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos("a", "b", 3)'], errors)
 
   errors = ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4']
-  v9.CheckDefAndScriptFailure(['searchpair("a", "b", "c", 4)'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", "b", "c", 4)'], errors)
 
   new
   setline(1, "match this")
   errors = ['E1013: Argument 5: type mismatch, expected func(...): any but got list<number>', 'E730: Using a List as a String']
-  v9.CheckDefAndScriptFailure(['searchpair("a", "b", "c", "r", [0])'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", [0])'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", "b", "c", "r", [0])'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", [0])'], errors)
   bwipe!
 
   errors = ['E1013: Argument 6: type mismatch, expected number but got string', 'E1210: Number required for argument 6']
-  v9.CheckDefAndScriptFailure(['searchpair("a", "b", "c", "r", "1", "f")'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", "1", "f")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", "b", "c", "r", "1", "f")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", "1", "f")'], errors)
 
   errors = ['E1013: Argument 7: type mismatch, expected number but got string', 'E1210: Number required for argument 7']
-  v9.CheckDefAndScriptFailure(['searchpair("a", "b", "c", "r", "1", 3, "g")'], errors)
-  v9.CheckDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", "1", 3, "g")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpair("a", "b", "c", "r", "1", 3, "g")'], errors)
+  v9.CheckSourceDefAndScriptFailure(['searchpairpos("a", "b", "c", "r", "1", 3, "g")'], errors)
 enddef
 
 def Test_searchpos()
   assert_equal(['x', 'x'], searchpos('.')->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['searchpos(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['searchpos("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['searchpos("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['searchpos("a", "b", 3, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['searchpos(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['searchpos("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['searchpos("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['searchpos("a", "b", 3, "d")'], ['E1013: Argument 4: type mismatch, expected number but got string', 'E1210: Number required for argument 4'])
   new
   setline(1, "match this")
-  v9.CheckDefAndScriptFailure(['searchpos("a", "", 9, 0, [0])'], ['E1013: Argument 5: type mismatch, expected func(...): any but got list<number>', 'E730: Using a List as a String'])
+  v9.CheckSourceDefAndScriptFailure(['searchpos("a", "", 9, 0, [0])'], ['E1013: Argument 5: type mismatch, expected func(...): any but got list<number>', 'E730: Using a List as a String'])
   bwipe!
 enddef
 
 def Test_server2client()
   CheckFeature clientserver
   CheckEnv DISPLAY
-  v9.CheckDefAndScriptFailure(['server2client(10, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['server2client("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['server2client("", "a")'], 'E573: Invalid server id used')
-  v9.CheckDefExecAndScriptFailure(['server2client("", "")'], 'E573: Invalid server id used')
+  v9.CheckSourceDefAndScriptFailure(['server2client(10, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['server2client("a", 10)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['server2client("", "a")'], 'E573: Invalid server id used')
+  v9.CheckSourceDefExecAndScriptFailure(['server2client("", "")'], 'E573: Invalid server id used')
 enddef
 
 def Test_shellescape()
-  v9.CheckDefAndScriptFailure(['shellescape(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['shellescape("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['shellescape(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['shellescape("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   if has('unix')
     assert_equal("''", shellescape(''))
   endif
@@ -3837,7 +3837,7 @@
 
       exe 'bwipe! ' .. b
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 enddef
 
 def Test_setbufvar()
@@ -3864,8 +3864,8 @@
   setbufvar('%', 'myvar', 123)
   getbufvar('%', 'myvar')->assert_equal(123)
 
-  v9.CheckDefAndScriptFailure(['setbufvar(true, "v", 3)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setbufvar(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setbufvar(true, "v", 3)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setbufvar(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   assert_fails('setbufvar("%", "", 10)', 'E461: Illegal variable name')
 enddef
 
@@ -3878,10 +3878,10 @@
   setbufline(bnum, 5, 10)
   setbufline(bnum, 6, ['two', 11])
   assert_equal(['1', '2', '3', 'one', '10', 'two', '11'], getbufline(bnum, 1, '$'))
-  v9.CheckDefAndScriptFailure(['setbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['setbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
-  v9.CheckDefAndScriptFailure(['setbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['setbufline([1], 1, "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setbufline(1, [1], "x")'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['setbufline(' .. bnum .. ', -1, "x")'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefAndScriptFailure(['setbufline(1, 1, {"a": 10})'], ['E1013: Argument 3: type mismatch, expected string but got dict<number>', 'E1224: String, Number or List required for argument 3'])
   bnum->bufwinid()->win_gotoid()
   setbufline('', 1, 'nombres')
   getline(1)->assert_equal('nombres')
@@ -3889,53 +3889,53 @@
 enddef
 
 def Test_setcellwidths()
-  v9.CheckDefAndScriptFailure(['setcellwidths(1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setcellwidths({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcellwidths(1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcellwidths({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
 enddef
 
 def Test_setcharpos()
-  v9.CheckDefAndScriptFailure(['setcharpos(1, [])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefFailure(['setcharpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
-  v9.CheckDefAndScriptFailure(['setcharpos(".", 1)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['setcharpos("", [0, 1, 1, 1])'], 'E474: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['setcharpos(1, [])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefFailure(['setcharpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
+  v9.CheckSourceDefAndScriptFailure(['setcharpos(".", 1)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['setcharpos("", [0, 1, 1, 1])'], 'E474: Invalid argument')
 enddef
 
 def Test_setcharsearch()
-  v9.CheckDefAndScriptFailure(['setcharsearch("x")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setcharsearch([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcharsearch("x")'], ['E1013: Argument 1: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcharsearch([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
   var d: dict<any> = {char: 'x', forward: 1, until: 1}
   setcharsearch(d)
   assert_equal(d, getcharsearch())
 enddef
 
 def Test_setcmdline()
-  v9.CheckDefAndScriptSuccess(['setcmdline("ls", 2)'])
-  v9.CheckDefAndScriptFailure(['setcmdline(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setcmdline("ls", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptSuccess(['setcmdline("ls", 2)'])
+  v9.CheckSourceDefAndScriptFailure(['setcmdline(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcmdline("ls", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_setcmdpos()
-  v9.CheckDefAndScriptFailure(['setcmdpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcmdpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_setcursorcharpos()
-  v9.CheckDefAndScriptFailure(['setcursorcharpos(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected number but got blob', 'E1224: String, Number or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setcursorcharpos(1, "2")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['setcursorcharpos(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['setcursorcharpos("", 10)'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['setcursorcharpos(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected number but got blob', 'E1224: String, Number or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setcursorcharpos(1, "2")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setcursorcharpos(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['setcursorcharpos("", 10)'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_setenv()
-  v9.CheckDefAndScriptFailure(['setenv(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setenv(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal(0, setenv('', ''))
   assert_equal(0, setenv('', v:null))
 enddef
 
 def Test_setfperm()
-  v9.CheckDefAndScriptFailure(['setfperm(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setfperm("a", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['setfperm("Xfile", "")'], 'E475: Invalid argument')
-  v9.CheckDefExecAndScriptFailure(['setfperm("", "")'], 'E475: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['setfperm(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setfperm("a", 0z10)'], ['E1013: Argument 2: type mismatch, expected string but got blob', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['setfperm("Xfile", "")'], 'E475: Invalid argument')
+  v9.CheckSourceDefExecAndScriptFailure(['setfperm("", "")'], 'E475: Invalid argument')
   assert_equal(0, setfperm('', 'rw-r--r--'))
 enddef
 
@@ -3949,9 +3949,9 @@
   assert_equal(['one', 'b', 'c', 'd'], getline(1, '$'))
   setline(1, 10)
   assert_equal(['10', 'b', 'c', 'd'], getline(1, '$'))
-  v9.CheckDefAndScriptFailure(['setline([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['setline("", "x")'], 'E1209: Invalid value for a line number')
-  v9.CheckDefExecAndScriptFailure(['setline(-1, "x")'], 'E966: Invalid line number: -1')
+  v9.CheckSourceDefAndScriptFailure(['setline([1], "x")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['setline("", "x")'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefExecAndScriptFailure(['setline(-1, "x")'], 'E966: Invalid line number: -1')
   assert_fails('setline(".a", "x")', ['E1209:', 'E1209:'])
   bw!
 enddef
@@ -3961,28 +3961,28 @@
   var what = {items: items}
   setqflist([], ' ', what)
   setloclist(0, [], ' ', what)
-  v9.CheckDefAndScriptFailure(['setloclist("1", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setloclist(1, 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['setloclist(1, [], 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
-  v9.CheckDefAndScriptFailure(['setloclist(1, [], "a", [])'], ['E1013: Argument 4: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['setloclist("1", [])'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setloclist(1, 2)'], ['E1013: Argument 2: type mismatch, expected list<any> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setloclist(1, [], 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['setloclist(1, [], "a", [])'], ['E1013: Argument 4: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 4'])
 enddef
 
 def Test_setmatches()
-  v9.CheckDefAndScriptFailure(['setmatches({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setmatches([], "1")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setmatches({})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setmatches([], "1")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_setpos()
-  v9.CheckDefAndScriptFailure(['setpos(1, [])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefFailure(['setpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
-  v9.CheckDefAndScriptFailure(['setpos(".", 1)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['setpos("", [0, 1, 1, 1])'], 'E474: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['setpos(1, [])'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefFailure(['setpos(".", ["a"])'], 'E1013: Argument 2: type mismatch, expected list<number> but got list<string>')
+  v9.CheckSourceDefAndScriptFailure(['setpos(".", 1)'], ['E1013: Argument 2: type mismatch, expected list<number> but got number', 'E1211: List required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['setpos("", [0, 1, 1, 1])'], 'E474: Invalid argument')
 enddef
 
 def Test_setqflist()
-  v9.CheckDefAndScriptFailure(['setqflist(1, "")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setqflist([], 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['setqflist([], "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['setqflist(1, "")'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setqflist([], 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setqflist([], "", [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_setreg()
@@ -3991,111 +3991,111 @@
   setreg('a', reginfo)
   getreginfo('a')->assert_equal(reginfo)
   assert_fails('setreg("ab", 0)', 'E1162:')
-  v9.CheckDefAndScriptFailure(['setreg(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setreg("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['setreg(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setreg("a", "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   setreg('', '1a2b3c')
   assert_equal('1a2b3c', @")
 enddef
 
 def Test_settabvar()
-  v9.CheckDefAndScriptFailure(['settabvar("a", "b", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['settabvar(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['settabvar("a", "b", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['settabvar(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   assert_fails('settabvar(1, "", 10)', 'E461: Illegal variable name')
 enddef
 
 def Test_settabwinvar()
-  v9.CheckDefAndScriptFailure(['settabwinvar("a", 2, "c", true)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['settabwinvar(1, "b", "c", [])'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['settabwinvar(1, 1, 3, {})'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['settabwinvar("a", 2, "c", true)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['settabwinvar(1, "b", "c", [])'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['settabwinvar(1, 1, 3, {})'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   assert_fails('settabwinvar(1, 1, "", 10)', 'E461: Illegal variable name')
 enddef
 
 def Test_settagstack()
-  v9.CheckDefAndScriptFailure(['settagstack(true, {})'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['settagstack(1, [1])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefAndScriptFailure(['settagstack(1, {}, 2)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['settagstack(true, {})'], ['E1013: Argument 1: type mismatch, expected number but got bool', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['settagstack(1, [1])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['settagstack(1, {}, 2)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   assert_fails('settagstack(1, {}, "")', 'E962: Invalid action')
 enddef
 
 def Test_setwinvar()
-  v9.CheckDefAndScriptFailure(['setwinvar("a", "b", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['setwinvar(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['setwinvar("a", "b", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['setwinvar(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
   assert_fails('setwinvar(1, "", 10)', 'E461: Illegal variable name')
   assert_fails('setwinvar(0, "&rulerformat", true)', ['E928:', 'E928:'])
 enddef
 
 def Test_sha256()
-  v9.CheckDefAndScriptFailure(['sha256(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sha256(0zABCD)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sha256(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sha256(0zABCD)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
   assert_equal('ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad', sha256('abc'))
   assert_equal('e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', sha256(''))
 enddef
 
 def Test_shiftwidth()
-  v9.CheckDefAndScriptFailure(['shiftwidth("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['shiftwidth("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_sign_define()
-  v9.CheckDefAndScriptFailure(['sign_define({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_define({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_define("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['sign_define({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_define({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_define("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_sign_getdefined()
-  v9.CheckDefAndScriptFailure(['sign_getdefined(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_getdefined(2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_getdefined(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_getdefined(2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   sign_getdefined('')->assert_equal([])
 enddef
 
 def Test_sign_getplaced()
-  v9.CheckDefAndScriptFailure(['sign_getplaced(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_getplaced(1, ["a"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefAndScriptFailure(['sign_getplaced("a", 1.1)'], ['E1013: Argument 2: type mismatch, expected dict<any> but got float', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['sign_getplaced(bufnr(), {lnum: ""})'], 'E1030: Using a String as a Number:')
+  v9.CheckSourceDefAndScriptFailure(['sign_getplaced(["x"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_getplaced(1, ["a"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['sign_getplaced("a", 1.1)'], ['E1013: Argument 2: type mismatch, expected dict<any> but got float', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['sign_getplaced(bufnr(), {lnum: ""})'], 'E1030: Using a String as a Number:')
   sign_getplaced('')->assert_equal([{signs: [], bufnr: bufnr()}])
 enddef
 
 def Test_sign_jump()
-  v9.CheckDefAndScriptFailure(['sign_jump("a", "b", "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_jump(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['sign_jump(1, "b", true)'], ['E1013: Argument 3: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['sign_jump("a", "b", "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_jump(1, 2, 3)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['sign_jump(1, "b", true)'], ['E1013: Argument 3: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 3'])
 enddef
 
 def Test_sign_place()
-  v9.CheckDefAndScriptFailure(['sign_place("a", "b", "c", "d")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_place(1, 2, "c", "d")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['sign_place(1, "b", 3, "d")'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
-  v9.CheckDefAndScriptFailure(['sign_place(1, "b", "c", 1.1)'], ['E1013: Argument 4: type mismatch, expected string but got float', 'E1220: String or Number required for argument 4'])
-  v9.CheckDefAndScriptFailure(['sign_place(1, "b", "c", "d", [1])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 5'])
-  v9.CheckDefExecAndScriptFailure(['sign_place(0, "", "MySign", bufnr(), {lnum: ""})'], 'E1209: Invalid value for a line number: ""')
+  v9.CheckSourceDefAndScriptFailure(['sign_place("a", "b", "c", "d")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_place(1, 2, "c", "d")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['sign_place(1, "b", 3, "d")'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['sign_place(1, "b", "c", 1.1)'], ['E1013: Argument 4: type mismatch, expected string but got float', 'E1220: String or Number required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['sign_place(1, "b", "c", "d", [1])'], ['E1013: Argument 5: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 5'])
+  v9.CheckSourceDefExecAndScriptFailure(['sign_place(0, "", "MySign", bufnr(), {lnum: ""})'], 'E1209: Invalid value for a line number: ""')
   assert_fails("sign_place(0, '', '', '')", 'E155:')
 enddef
 
 def Test_sign_placelist()
-  v9.CheckDefAndScriptFailure(['sign_placelist("x")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_placelist({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['sign_placelist([{"name": "MySign", "buffer": bufnr(), "lnum": ""}])'], 'E1209: Invalid value for a line number: ""')
+  v9.CheckSourceDefAndScriptFailure(['sign_placelist("x")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_placelist({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['sign_placelist([{"name": "MySign", "buffer": bufnr(), "lnum": ""}])'], 'E1209: Invalid value for a line number: ""')
   assert_fails('sign_placelist([{name: "MySign", buffer: "", lnum: 1}])', 'E155:')
 enddef
 
 def Test_sign_undefine()
-  v9.CheckDefAndScriptFailure(['sign_undefine({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_undefine([1])'], ['E1013: Argument 1: type mismatch, expected list<string> but got list<number>', 'E155: Unknown sign:'])
+  v9.CheckSourceDefAndScriptFailure(['sign_undefine({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_undefine([1])'], ['E1013: Argument 1: type mismatch, expected list<string> but got list<number>', 'E155: Unknown sign:'])
 enddef
 
 def Test_sign_unplace()
-  v9.CheckDefAndScriptFailure(['sign_unplace({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_unplace({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_unplace("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['sign_unplace({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_unplace({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_unplace("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_sign_unplacelist()
-  v9.CheckDefAndScriptFailure(['sign_unplacelist("x")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sign_unplacelist({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_unplacelist("x")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sign_unplacelist({"a": 10})'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
 enddef
 
 def Test_simplify()
-  v9.CheckDefAndScriptFailure(['simplify(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['simplify(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   call assert_equal('NonExistingFile', simplify('NonExistingFile'))
   simplify('')->assert_equal('')
 enddef
@@ -4105,9 +4105,9 @@
   assert_equal(['val'], lds->slice(0, 1)->map((_, v) => 'val'))
   assert_equal(['val'], lds[ : ]->map((_, v) => 'val'))
 
-  v9.CheckDefAndScriptFailure(['slice({"a": 10}, 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['slice([1, 2, 3], "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['slice("abc", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['slice({"a": 10}, 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<number>', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['slice([1, 2, 3], "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['slice("abc", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 enddef
 
 def Test_spellsuggest()
@@ -4116,29 +4116,29 @@
   else
     spellsuggest('marrch', 1, true)->assert_equal(['March'])
   endif
-  v9.CheckDefAndScriptFailure(['spellsuggest(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['spellsuggest("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['spellsuggest("a", 1, 0z01)'], ['E1013: Argument 3: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['spellsuggest(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['spellsuggest("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['spellsuggest("a", 1, 0z01)'], ['E1013: Argument 3: type mismatch, expected bool but got blob', 'E1212: Bool required for argument 3'])
   spellsuggest('')->assert_equal([])
 enddef
 
 def Test_sound_playevent()
   CheckFeature sound
-  v9.CheckDefAndScriptFailure(['sound_playevent(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sound_playevent(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
 enddef
 
 def Test_sound_playfile()
   CheckFeature sound
-  v9.CheckDefAndScriptFailure(['sound_playfile(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sound_playfile(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
 enddef
 
 def Test_sound_stop()
   CheckFeature sound
-  v9.CheckDefAndScriptFailure(['sound_stop("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sound_stop("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_soundfold()
-  v9.CheckDefAndScriptFailure(['soundfold(20)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['soundfold(20)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal('abc', soundfold('abc'))
   assert_equal('', soundfold(''))
 enddef
@@ -4160,12 +4160,12 @@
     sort(l, Compare)
     assert_equal([1, 2, 3, 4, 5, 6, 7, 8], l)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
       sort([1, 2, 3], (a: any, b: any) => 1)
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
       vim9script
@@ -4176,7 +4176,7 @@
       enddef
       SortedList()->assert_equal([1, 2, 3])
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 enddef
 
 def Test_sort_const()
@@ -4184,12 +4184,12 @@
       const l = [1, 2, 3, 4]
       sort(l)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 enddef
 
 def Test_sort_compare_func_fails()
-  v9.CheckDefAndScriptFailure(['sort("a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['sort([1], "", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['sort("a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['sort([1], "", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 
   var lines =<< trim END
     vim9script
@@ -4202,31 +4202,31 @@
       var l = [1, 2, 3]
       sort(l, (a: string, b: number) => 1)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number', 'E1013: Argument 1: type mismatch, expected string but got number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number', 'E1013: Argument 1: type mismatch, expected string but got number'])
 
   lines =<< trim END
       var l = ['a', 'b', 'c']
       sort(l, (a: string, b: number) => 1)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?string): number but got func(string, number): number', 'E1013: Argument 2: type mismatch, expected number but got string'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?string, ?string): number but got func(string, number): number', 'E1013: Argument 2: type mismatch, expected number but got string'])
 
   lines =<< trim END
       sort([1, 2, 3], (a: number, b: number) => true)
   END
-  v9.CheckDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, number): bool', 'E1138: Using a Bool as a Number'])
+  v9.CheckSourceDefAndScriptFailure(lines, ['E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, number): bool', 'E1138: Using a Bool as a Number'])
 enddef
 
 def Test_spellbadword()
-  v9.CheckDefAndScriptFailure(['spellbadword(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['spellbadword(100)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   spellbadword('good')->assert_equal(['', ''])
   spellbadword('')->assert_equal(['', ''])
 enddef
 
 def Test_split()
   split('  aa  bb  ', '\W\+', true)->assert_equal(['', 'aa', 'bb', ''])
-  v9.CheckDefAndScriptFailure(['split(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['split("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['split("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['split(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['split("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['split("a", "b", 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
   split('')->assert_equal([])
   split('', '')->assert_equal([])
 enddef
@@ -4235,12 +4235,12 @@
   var expected = srand()->len()->range()->map((_, _) => 'x')
   assert_equal(expected, srand()->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['srand("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['srand("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
   type(srand(100))->assert_equal(v:t_list)
 enddef
 
 def Test_state()
-  v9.CheckDefAndScriptFailure(['state({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['state({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
   assert_equal('', state('a'))
 enddef
 
@@ -4249,14 +4249,14 @@
   str2float("2e-2")->assert_equal(0.02)
   str2float('')->assert_equal(0.0)
 
-  v9.CheckDefAndScriptFailure(['str2float(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['str2float(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
 enddef
 
 def Test_str2list()
   assert_equal(['x', 'x', 'x'], str2list('abc')->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['str2list(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['str2list("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['str2list(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['str2list("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   assert_equal([97], str2list('a'))
   assert_equal([97], str2list('a', 1))
   assert_equal([97], str2list('a', true))
@@ -4267,29 +4267,29 @@
   str2nr("1'000'000", 10, true)->assert_equal(1000000)
   str2nr('')->assert_equal(0)
 
-  v9.CheckDefAndScriptFailure(['str2nr(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['str2nr("123", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['str2nr("123", 10, "x")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['str2nr(123)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['str2nr("123", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['str2nr("123", 10, "x")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
 enddef
 
 def Test_strcharlen()
-  v9.CheckDefAndScriptFailure(['strcharlen([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strcharlen([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
   "abc"->strcharlen()->assert_equal(3)
   strcharlen(99)->assert_equal(2)
 enddef
 
 def Test_strcharpart()
-  v9.CheckDefAndScriptFailure(['strcharpart(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strcharpart("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['strcharpart("a", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['strcharpart("a", 1, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['strcharpart(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strcharpart("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strcharpart("a", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['strcharpart("a", 1, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   strcharpart('', 0)->assert_equal('')
 enddef
 
 def Test_strchars()
   strchars("A\u20dd", true)->assert_equal(1)
-  v9.CheckDefAndScriptFailure(['strchars(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strchars("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strchars(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strchars("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   assert_equal(3, strchars('abc'))
   assert_equal(3, strchars('abc', 1))
   assert_equal(3, strchars('abc', true))
@@ -4297,46 +4297,46 @@
 enddef
 
 def Test_strdisplaywidth()
-  v9.CheckDefAndScriptFailure(['strdisplaywidth(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strdisplaywidth("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strdisplaywidth(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strdisplaywidth("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
   strdisplaywidth('')->assert_equal(0)
 enddef
 
 def Test_strftime()
   if exists('*strftime')
-    v9.CheckDefAndScriptFailure(['strftime(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['strftime("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['strftime(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['strftime("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
     strftime('')->assert_equal('')
   endif
 enddef
 
 def Test_strgetchar()
-  v9.CheckDefAndScriptFailure(['strgetchar(1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strgetchar("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strgetchar(1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strgetchar("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
   strgetchar('', 0)->assert_equal(-1)
   strgetchar('', 1)->assert_equal(-1)
 enddef
 
 def Test_stridx()
-  v9.CheckDefAndScriptFailure(['stridx([1], "b")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['stridx("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['stridx("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['stridx([1], "b")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['stridx("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['stridx("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   stridx('', '')->assert_equal(0)
   stridx('', 'a')->assert_equal(-1)
   stridx('a', '')->assert_equal(0)
 enddef
 
 def Test_strlen()
-  v9.CheckDefAndScriptFailure(['strlen([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strlen([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
   "abc"->strlen()->assert_equal(3)
   strlen(99)->assert_equal(2)
 enddef
 
 def Test_strpart()
-  v9.CheckDefAndScriptFailure(['strpart(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strpart("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['strpart("a", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
-  v9.CheckDefAndScriptFailure(['strpart("a", 1, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['strpart(1, 2)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strpart("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strpart("a", 1, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['strpart("a", 1, 1, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   strpart('', 0)->assert_equal('')
 enddef
 
@@ -4344,8 +4344,8 @@
   CheckFunction strptime
   CheckNotBSD
   if exists_compiled('*strptime')
-    v9.CheckDefAndScriptFailure(['strptime(10, "2021")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-    v9.CheckDefAndScriptFailure(['strptime("%Y", 2021)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['strptime(10, "2021")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['strptime("%Y", 2021)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
     assert_notequal(0, strptime('%Y', '2021'))
     # This fails on BSD 14 and returns
     # -2209078800 instead of 0
@@ -4354,30 +4354,30 @@
 enddef
 
 def Test_strridx()
-  v9.CheckDefAndScriptFailure(['strridx([1], "b")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strridx("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['strridx("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['strridx([1], "b")'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strridx("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strridx("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   strridx('', '')->assert_equal(0)
   strridx('', 'a')->assert_equal(-1)
   strridx('a', '')->assert_equal(1)
 enddef
 
 def Test_strtrans()
-  v9.CheckDefAndScriptFailure(['strtrans(20)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strtrans(20)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal('abc', strtrans('abc'))
   strtrans('')->assert_equal('')
 enddef
 
 def Test_strutf16len()
-  v9.CheckDefAndScriptFailure(['strutf16len([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['strutf16len("a", "")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['strutf16len([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strutf16len("a", "")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
   ""->strutf16len()->assert_equal(0)
   '-ą́-ą́'->strutf16len(true)->assert_equal(8)
   '-ą́-ą́'->strutf16len(false)->assert_equal(4)
 enddef
 
 def Test_strwidth()
-  v9.CheckDefAndScriptFailure(['strwidth(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['strwidth(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal(4, strwidth('abcd'))
   strwidth('')->assert_equal(0)
 enddef
@@ -4388,8 +4388,8 @@
   var actual = substitute('A123456789', pat, Rep, '')
   var expected = "[['A123456789'], ['1'], ['2'], ['3'], ['4'], ['5'], ['6'], ['7'], ['8'], ['9']]"
   actual->assert_equal(expected)
-  v9.CheckDefAndScriptFailure(['submatch("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['submatch(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['submatch("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['submatch(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_substitute()
@@ -4400,30 +4400,30 @@
     assert_fails('"text"->substitute(".*", () => test_null_job(), "")', 'E908: Using an invalid value as a String: job')
     assert_fails('"text"->substitute(".*", () => test_null_channel(), "")', 'E908: Using an invalid value as a String: channel')
   endif
-  v9.CheckDefAndScriptFailure(['substitute(1, "b", "1", "d")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['substitute("a", 2, "1", "d")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['substitute("a", "b", "1", 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['substitute(1, "b", "1", "d")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['substitute("a", 2, "1", "d")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['substitute("a", "b", "1", 4)'], ['E1013: Argument 4: type mismatch, expected string but got number', 'E1174: String required for argument 4'])
   substitute('', '', '', '')->assert_equal('')
 
   var lines =<< trim END
     assert_equal("4", substitute("3", '\d', '\=str2nr(submatch(0)) + 1', 'g'))
   END
-  v9.CheckDefAndScriptSuccess(lines)
+  v9.CheckSourceDefAndScriptSuccess(lines)
 
   lines =<< trim END
     assert_equal("4", substitute("3", '\d', '\="text" x', 'g'))
   END
-  v9.CheckDefAndScriptFailure(lines, 'E488: Trailing characters: x')
+  v9.CheckSourceDefAndScriptFailure(lines, 'E488: Trailing characters: x')
 enddef
 
 def Test_swapinfo()
-  v9.CheckDefAndScriptFailure(['swapinfo({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['swapinfo({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1174: String required for argument 1'])
   call swapinfo('x')->assert_equal({error: 'Cannot open file'})
   call swapinfo('')->assert_equal({error: 'Cannot open file'})
 enddef
 
 def Test_swapname()
-  v9.CheckDefAndScriptFailure(['swapname([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['swapname([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
   assert_fails('swapname("NonExistingBuf")', 'E94:')
 enddef
 
@@ -4432,46 +4432,46 @@
   setline(1, "text")
   synID(1, 1, true)->assert_equal(0)
   bwipe!
-  v9.CheckDefAndScriptFailure(['synID(0z10, 1, true)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['synID("a", true, false)'], ['E1013: Argument 2: type mismatch, expected number but got bool', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['synID(1, 1, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['synID("", 10, true)'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['synID(0z10, 1, true)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['synID("a", true, false)'], ['E1013: Argument 2: type mismatch, expected number but got bool', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['synID(1, 1, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['synID("", 10, true)'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_synIDattr()
-  v9.CheckDefAndScriptFailure(['synIDattr("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['synIDattr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['synIDattr(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['synIDattr("a", "b")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['synIDattr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['synIDattr(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   synIDattr(1, '', '')->assert_equal('')
 enddef
 
 def Test_synIDtrans()
-  v9.CheckDefAndScriptFailure(['synIDtrans("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['synIDtrans("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_synconcealed()
-  v9.CheckDefAndScriptFailure(['synconcealed(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['synconcealed(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['synconcealed(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['synconcealed(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
   if has('conceal')
-    v9.CheckDefExecAndScriptFailure(['synconcealed("", 4)'], 'E1209: Invalid value for a line number')
+    v9.CheckSourceDefExecAndScriptFailure(['synconcealed("", 4)'], 'E1209: Invalid value for a line number')
   endif
 enddef
 
 def Test_synstack()
-  v9.CheckDefAndScriptFailure(['synstack(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['synstack(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['synstack("", 4)'], 'E1209: Invalid value for a line number')
+  v9.CheckSourceDefAndScriptFailure(['synstack(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['synstack(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['synstack("", 4)'], 'E1209: Invalid value for a line number')
 enddef
 
 def Test_system()
-  v9.CheckDefAndScriptFailure(['system(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['system("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1224: String, Number or List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['system(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['system("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1224: String, Number or List required for argument 2'])
   assert_equal("123\n", system('echo 123'))
 enddef
 
 def Test_systemlist()
-  v9.CheckDefAndScriptFailure(['systemlist(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['systemlist("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1224: String, Number or List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['systemlist(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['systemlist("a", {})'], ['E1013: Argument 2: type mismatch, expected string but got dict<any>', 'E1224: String, Number or List required for argument 2'])
   if has('win32')
     call assert_equal(["123\r"], systemlist('echo 123'))
   else
@@ -4480,106 +4480,106 @@
 enddef
 
 def Test_tabpagebuflist()
-  v9.CheckDefAndScriptFailure(['tabpagebuflist("t")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tabpagebuflist("t")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
   assert_equal([bufnr('')], tabpagebuflist())
   assert_equal([bufnr('')], tabpagebuflist(1))
   assert_equal(['x'], tabpagebuflist()->map((_, _) => 'x'))
 enddef
 
 def Test_tabpagenr()
-  v9.CheckDefAndScriptFailure(['tabpagenr(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['tabpagenr("")'], 'E15: Invalid expression')
+  v9.CheckSourceDefAndScriptFailure(['tabpagenr(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['tabpagenr("")'], 'E15: Invalid expression')
   assert_equal(1, tabpagenr('$'))
   assert_equal(1, tabpagenr())
 enddef
 
 def Test_tabpagewinnr()
-  v9.CheckDefAndScriptFailure(['tabpagewinnr("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['tabpagewinnr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['tabpagewinnr(1, "")'], 'E15: Invalid expression')
+  v9.CheckSourceDefAndScriptFailure(['tabpagewinnr("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tabpagewinnr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['tabpagewinnr(1, "")'], 'E15: Invalid expression')
 enddef
 
 def Test_taglist()
-  v9.CheckDefAndScriptFailure(['taglist([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['taglist("a", [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['taglist([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['taglist("a", [2])'], ['E1013: Argument 2: type mismatch, expected string but got list<number>', 'E1174: String required for argument 2'])
   taglist('')->assert_equal(0)
   taglist('', '')->assert_equal(0)
 enddef
 
 def Test_term_dumpload()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_dumpload({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_dumpload({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_dumpload("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['term_dumpload("")'], 'E485: Can''t read file')
+  v9.CheckSourceDefAndScriptFailure(['term_dumpload({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpload({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpload("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<string>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['term_dumpload("")'], 'E485: Can''t read file')
 enddef
 
 def Test_term_dumpdiff()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_dumpdiff(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_dumpdiff("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['term_dumpdiff("a", "b", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['term_dumpdiff("", "")'], 'E485: Can''t read file')
+  v9.CheckSourceDefAndScriptFailure(['term_dumpdiff(1, "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpdiff("a", 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpdiff("a", "b", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['term_dumpdiff("", "")'], 'E485: Can''t read file')
 enddef
 
 def Test_term_dumpwrite()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_dumpwrite(true, "b")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_dumpwrite(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['term_dumpwrite("a", "b", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpwrite(true, "b")'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpwrite(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_dumpwrite("a", "b", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_term_getaltscreen()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getaltscreen(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getaltscreen(true)'], ['E1013: Argument 1: type mismatch, expected string but got bool', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getansicolors()
   CheckRunVimInTerminal
   CheckFeature termguicolors
-  v9.CheckDefAndScriptFailure(['term_getansicolors(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getansicolors(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getattr()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getattr("x", "a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_getattr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_getattr("x", "a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getattr(1, 2)'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
 enddef
 
 def Test_term_getcursor()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getcursor({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getcursor({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getjob()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getjob(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getjob(0z10)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getline()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getline(1.1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_getline(1, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_getline(1.1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getline(1, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
 enddef
 
 def Test_term_getscrolled()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getscrolled(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getscrolled(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getsize()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getsize(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getsize(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_getstatus()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_getstatus(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_getstatus(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_gettitle()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_gettitle(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_gettitle(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
 enddef
 
 def Test_term_gettty()
@@ -4590,28 +4590,28 @@
     term_gettty(buf, true)->assert_notequal('')
     g:StopShellInTerminal(buf)
   endif
-  v9.CheckDefAndScriptFailure(['term_gettty([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_gettty(1, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_gettty([1])'], ['E1013: Argument 1: type mismatch, expected string but got list<number>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_gettty(1, 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_term_scrape()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_scrape(1.1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_scrape(1, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_scrape(1.1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_scrape(1, 1.1)'], ['E1013: Argument 2: type mismatch, expected string but got float', 'E1220: String or Number required for argument 2'])
 enddef
 
 def Test_term_sendkeys()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_sendkeys([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_sendkeys(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_sendkeys([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_sendkeys(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
 enddef
 
 def Test_term_setansicolors()
   CheckRunVimInTerminal
 
   if has('termguicolors') || has('gui')
-    v9.CheckDefAndScriptFailure(['term_setansicolors([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-    v9.CheckDefAndScriptFailure(['term_setansicolors(10, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
+    v9.CheckSourceDefAndScriptFailure(['term_setansicolors([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+    v9.CheckSourceDefAndScriptFailure(['term_setansicolors(10, {})'], ['E1013: Argument 2: type mismatch, expected list<any> but got dict<any>', 'E1211: List required for argument 2'])
   else
     throw 'Skipped: Only works with termguicolors or gui feature'
   endif
@@ -4619,27 +4619,27 @@
 
 def Test_term_setapi()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_setapi([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_setapi(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_setapi([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_setapi(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
 enddef
 
 def Test_term_setkill()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_setkill([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_setkill(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_setkill([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_setkill(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
 enddef
 
 def Test_term_setrestore()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_setrestore([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_setrestore(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_setrestore([], "p")'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_setrestore(1, [])'], ['E1013: Argument 2: type mismatch, expected string but got list<any>', 'E1174: String required for argument 2'])
 enddef
 
 def Test_term_setsize()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_setsize(1.1, 2, 3)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_setsize(1, "2", 3)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['term_setsize(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['term_setsize(1.1, 2, 3)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_setsize(1, "2", 3)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_setsize(1, 2, "3")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 enddef
 
 def Test_term_start()
@@ -4652,76 +4652,76 @@
     winnr()->assert_equal(winnr)
     bwipe!
   endif
-  v9.CheckDefAndScriptFailure(['term_start({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_start([], [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefAndScriptFailure(['term_start("", "")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
-  v9.CheckDefExecAndScriptFailure(['term_start("")'], 'E474: Invalid argument')
+  v9.CheckSourceDefAndScriptFailure(['term_start({})'], ['E1013: Argument 1: type mismatch, expected string but got dict<any>', 'E1222: String or List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_start([], [])'], ['E1013: Argument 2: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_start("", "")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefExecAndScriptFailure(['term_start("")'], 'E474: Invalid argument')
 enddef
 
 def Test_term_wait()
   CheckRunVimInTerminal
-  v9.CheckDefAndScriptFailure(['term_wait(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['term_wait(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['term_wait(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1220: String or Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['term_wait(1, "a")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_test_alloc_fail()
-  v9.CheckDefAndScriptFailure(['test_alloc_fail("a", 10, 20)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_alloc_fail(10, "b", 20)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['test_alloc_fail(10, 20, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['test_alloc_fail("a", 10, 20)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_alloc_fail(10, "b", 20)'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['test_alloc_fail(10, 20, "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
 enddef
 
 def Test_test_feedinput()
-  v9.CheckDefAndScriptFailure(['test_feedinput(test_void())'], ['E1013: Argument 1: type mismatch, expected string but got void', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_feedinput(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_feedinput(test_void())'], ['E1013: Argument 1: type mismatch, expected string but got void', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_feedinput(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_test_getvalue()
-  v9.CheckDefAndScriptFailure(['test_getvalue(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_getvalue(1.1)'], ['E1013: Argument 1: type mismatch, expected string but got float', 'E1174: String required for argument 1'])
 enddef
 
 def Test_test_gui_event()
   CheckGui
-  v9.CheckDefAndScriptFailure(['test_gui_event([], {})'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_gui_event("abc", 1)'], ['E1013: Argument 2: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['test_gui_event([], {})'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_gui_event("abc", 1)'], ['E1013: Argument 2: type mismatch, expected dict<any> but got number', 'E1206: Dictionary required for argument 2'])
 enddef
 
 def Test_test_ignore_error()
-  v9.CheckDefAndScriptFailure(['test_ignore_error([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_ignore_error([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
   test_ignore_error('RESET')
 enddef
 
 def Test_test_option_not_set()
-  v9.CheckDefAndScriptFailure(['test_option_not_set([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_option_not_set([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
 enddef
 
 def Test_test_override()
-  v9.CheckDefAndScriptFailure(['test_override(1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_override("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['test_override(1, 1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_override("a", "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_test_setmouse()
-  v9.CheckDefAndScriptFailure(['test_setmouse("a", 10)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_setmouse(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['test_setmouse("a", 10)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_setmouse(10, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_test_settime()
-  v9.CheckDefAndScriptFailure(['test_settime([1])'], ['E1013: Argument 1: type mismatch, expected number but got list<number>', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_settime([1])'], ['E1013: Argument 1: type mismatch, expected number but got list<number>', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_test_srand_seed()
-  v9.CheckDefAndScriptFailure(['test_srand_seed([1])'], ['E1013: Argument 1: type mismatch, expected number but got list<number>', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['test_srand_seed("10")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_srand_seed([1])'], ['E1013: Argument 1: type mismatch, expected number but got list<number>', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['test_srand_seed("10")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_timer_info()
-  v9.CheckDefAndScriptFailure(['timer_info("id")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['timer_info("id")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
   assert_equal([], timer_info(100))
   assert_equal([], timer_info()->filter((_, t) => t.callback->string() !~ 'TestTimeout'))
 enddef
 
 def Test_timer_pause()
-  v9.CheckDefAndScriptFailure(['timer_pause("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['timer_pause(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['timer_pause("x", 1)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['timer_pause(1, "a")'], ['E1013: Argument 2: type mismatch, expected bool but got string', 'E1212: Bool required for argument 2'])
 enddef
 
 def Test_timer_paused()
@@ -4733,31 +4733,31 @@
 enddef
 
 def Test_timer_start()
-  v9.CheckDefAndScriptFailure(['timer_start("a", "1")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['timer_start(1, "1", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['timer_start(100, 0)'], 'E921:')
-  v9.CheckDefExecAndScriptFailure(['timer_start(100, "")'], 'E921:')
+  v9.CheckSourceDefAndScriptFailure(['timer_start("a", "1")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['timer_start(1, "1", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefExecAndScriptFailure(['timer_start(100, 0)'], 'E921:')
+  v9.CheckSourceDefExecAndScriptFailure(['timer_start(100, "")'], 'E921:')
 enddef
 
 def Test_timer_stop()
-  v9.CheckDefAndScriptFailure(['timer_stop("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['timer_stop("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
   assert_equal(0, timer_stop(100))
 enddef
 
 def Test_tolower()
-  v9.CheckDefAndScriptFailure(['tolower(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tolower(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   tolower('')->assert_equal('')
 enddef
 
 def Test_toupper()
-  v9.CheckDefAndScriptFailure(['toupper(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['toupper(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   toupper('')->assert_equal('')
 enddef
 
 def Test_tr()
-  v9.CheckDefAndScriptFailure(['tr(1, "a", "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['tr("a", 1, "b")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['tr("a", "a", 1)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['tr(1, "a", "b")'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['tr("a", 1, "b")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['tr("a", "a", 1)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
   tr('', '', '')->assert_equal('')
   tr('ab', '', '')->assert_equal('ab')
   assert_fails("tr('ab', 'ab', '')", 'E475:')
@@ -4765,9 +4765,9 @@
 enddef
 
 def Test_trim()
-  v9.CheckDefAndScriptFailure(['trim(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['trim("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1174: String required for argument 2'])
-  v9.CheckDefAndScriptFailure(['trim("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['trim(["a"])'], ['E1013: Argument 1: type mismatch, expected string but got list<string>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['trim("a", ["b"])'], ['E1013: Argument 2: type mismatch, expected string but got list<string>', 'E1174: String required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['trim("a", "b", "c")'], ['E1013: Argument 3: type mismatch, expected number but got string', 'E1210: Number required for argument 3'])
   trim('')->assert_equal('')
   trim('', '')->assert_equal('')
 enddef
@@ -4788,23 +4788,23 @@
 enddef
 
 def Test_undofile()
-  v9.CheckDefAndScriptFailure(['undofile(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['undofile(10)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   assert_equal('.abc.un~', fnamemodify(undofile('abc'), ':t'))
   undofile('')->assert_equal('')
 enddef
 
 def Test_uniq()
-  v9.CheckDefAndScriptFailure(['uniq("a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['uniq([1], "", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['uniq("a")'], ['E1013: Argument 1: type mismatch, expected list<any> but got string', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['uniq([1], "", [1])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<number>', 'E1206: Dictionary required for argument 3'])
 
-  v9.CheckDefFailure(['var l: list<number> = uniq(["a", "b"])'], 'E1012: Type mismatch; expected list<number> but got list<string>')
+  v9.CheckSourceDefFailure(['var l: list<number> = uniq(["a", "b"])'], 'E1012: Type mismatch; expected list<number> but got list<string>')
 enddef
 
 def Test_utf16idx()
-  v9.CheckDefAndScriptFailure(['utf16idx(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
-  v9.CheckDefAndScriptFailure(['utf16idx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['utf16idx("a", 1, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
-  v9.CheckDefAndScriptFailure(['utf16idx("a", 1, 0, "")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
+  v9.CheckSourceDefAndScriptFailure(['utf16idx(0z10, 1)'], ['E1013: Argument 1: type mismatch, expected string but got blob', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['utf16idx("a", "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['utf16idx("a", 1, "")'], ['E1013: Argument 3: type mismatch, expected bool but got string', 'E1212: Bool required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['utf16idx("a", 1, 0, "")'], ['E1013: Argument 4: type mismatch, expected bool but got string', 'E1212: Bool required for argument 4'])
   utf16idx('', 0)->assert_equal(0)
   utf16idx('', 1)->assert_equal(-1)
 enddef
@@ -4814,11 +4814,11 @@
       const l = [1, 2, 3, 4]
       uniq(l)
   END
-  v9.CheckDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
+  v9.CheckSourceDefFailure(lines, 'E1307: Argument 1: Trying to modify a const list<number>')
 enddef
 
 def Test_values()
-  v9.CheckDefAndScriptFailure(['values([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['values([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
   assert_equal([], {}->values())
   assert_equal(['sun'], {star: 'sun'}->values())
 
@@ -4845,20 +4845,20 @@
 
       Process(D)
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 enddef
 
 def Test_virtcol()
-  v9.CheckDefAndScriptFailure(['virtcol(1.1)'], [
+  v9.CheckSourceDefAndScriptFailure(['virtcol(1.1)'], [
     'E1013: Argument 1: type mismatch, expected string but got float',
     'E1222: String or List required for argument 1'])
-  v9.CheckDefAndScriptFailure(['virtcol(".", "a")'], [
+  v9.CheckSourceDefAndScriptFailure(['virtcol(".", "a")'], [
     'E1013: Argument 2: type mismatch, expected bool but got string',
     'E1212: Bool required for argument 2'])
-  v9.CheckDefAndScriptFailure(['virtcol(".", v:true, [])'], [
+  v9.CheckSourceDefAndScriptFailure(['virtcol(".", v:true, [])'], [
     'E1013: Argument 3: type mismatch, expected number but got list',
     'E1210: Number required for argument 3'])
-  v9.CheckDefExecAndScriptFailure(['virtcol("")'],
+  v9.CheckSourceDefExecAndScriptFailure(['virtcol("")'],
     'E1209: Invalid value for a line number')
   new
   setline(1, ['abcde和平fgh'])
@@ -4874,8 +4874,8 @@
 enddef
 
 def Test_visualmode()
-  v9.CheckDefAndScriptFailure(['visualmode("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
-  v9.CheckDefAndScriptFailure(['visualmode(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['visualmode("1")'], ['E1013: Argument 1: type mismatch, expected bool but got string', 'E1212: Bool required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['visualmode(2)'], ['E1013: Argument 1: type mismatch, expected bool but got number', 'E1212: Bool required for argument 1'])
 enddef
 
 def Test_win_execute()
@@ -4883,29 +4883,29 @@
   assert_equal("\n" .. winnr(), 'echo winnr()'->win_execute(win_getid()))
   assert_equal("\n" .. winnr(), win_execute(win_getid(), 'echo winnr()', 'silent'))
   assert_equal('', win_execute(342343, 'echo winnr()'))
-  v9.CheckDefAndScriptFailure(['win_execute("a", "b", "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['win_execute(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1222: String or List required for argument 2'])
-  v9.CheckDefAndScriptFailure(['win_execute(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['win_execute("a", "b", "c")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_execute(1, 2, "c")'], ['E1013: Argument 2: type mismatch, expected string but got number', 'E1222: String or List required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['win_execute(1, "b", 3)'], ['E1013: Argument 3: type mismatch, expected string but got number', 'E1174: String required for argument 3'])
 enddef
 
 def Test_win_findbuf()
-  v9.CheckDefAndScriptFailure(['win_findbuf("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_findbuf("a")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
   assert_equal([], win_findbuf(1000))
   assert_equal([win_getid()], win_findbuf(bufnr('')))
 enddef
 
 def Test_win_getid()
-  v9.CheckDefAndScriptFailure(['win_getid(".")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['win_getid(1, ".")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['win_getid(".")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_getid(1, ".")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
   assert_equal(win_getid(), win_getid(1, 1))
 enddef
 
 def Test_win_gettype()
-  v9.CheckDefAndScriptFailure(['win_gettype("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_gettype("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_win_gotoid()
-  v9.CheckDefAndScriptFailure(['win_gotoid("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_gotoid("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 func Test_win_gotoid_in_mapping()
@@ -4950,43 +4950,43 @@
 endfunc
 
 def Test_win_id2tabwin()
-  v9.CheckDefAndScriptFailure(['win_id2tabwin("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_id2tabwin("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_win_id2win()
-  v9.CheckDefAndScriptFailure(['win_id2win("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_id2win("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_win_screenpos()
   assert_equal(['x', 'x'], win_screenpos(1)->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['win_screenpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_screenpos("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_win_splitmove()
   split
   win_splitmove(1, 2, {vertical: true, rightbelow: true})
   close
-  v9.CheckDefAndScriptFailure(['win_splitmove("a", 2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['win_splitmove(1, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
-  v9.CheckDefAndScriptFailure(['win_splitmove(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
+  v9.CheckSourceDefAndScriptFailure(['win_splitmove("a", 2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['win_splitmove(1, "b")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['win_splitmove(1, 2, [])'], ['E1013: Argument 3: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 3'])
 enddef
 
 def Test_winbufnr()
-  v9.CheckDefAndScriptFailure(['winbufnr("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['winbufnr("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_winheight()
-  v9.CheckDefAndScriptFailure(['winheight("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['winheight("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_winlayout()
-  v9.CheckDefAndScriptFailure(['winlayout("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['winlayout("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_winnr()
-  v9.CheckDefAndScriptFailure(['winnr([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
-  v9.CheckDefExecAndScriptFailure(['winnr("")'], 'E15: Invalid expression')
+  v9.CheckSourceDefAndScriptFailure(['winnr([])'], ['E1013: Argument 1: type mismatch, expected string but got list<any>', 'E1174: String required for argument 1'])
+  v9.CheckSourceDefExecAndScriptFailure(['winnr("")'], 'E15: Invalid expression')
   assert_equal(1, winnr())
   assert_equal(1, winnr('$'))
 enddef
@@ -5001,7 +5001,7 @@
 enddef
 
 def Test_winrestview()
-  v9.CheckDefAndScriptFailure(['winrestview([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['winrestview([])'], ['E1013: Argument 1: type mismatch, expected dict<any> but got list<any>', 'E1206: Dictionary required for argument 1'])
   :%d _
   setline(1, 'Hello World')
   winrestview({lnum: 1, col: 6})
@@ -5014,20 +5014,20 @@
   var lines =<< trim END
       var view: list<number> = winsaveview()
   END
-  v9.CheckDefAndScriptFailure(lines, 'E1012: Type mismatch; expected list<number> but got dict<number>', 1)
+  v9.CheckSourceDefAndScriptFailure(lines, 'E1012: Type mismatch; expected list<number> but got dict<number>', 1)
 enddef
 
 def Test_winwidth()
-  v9.CheckDefAndScriptFailure(['winwidth("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['winwidth("x")'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
 enddef
 
 def Test_xor()
-  v9.CheckDefAndScriptFailure(['xor("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
-  v9.CheckDefAndScriptFailure(['xor(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
+  v9.CheckSourceDefAndScriptFailure(['xor("x", 0x2)'], ['E1013: Argument 1: type mismatch, expected number but got string', 'E1210: Number required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['xor(0x1, "x")'], ['E1013: Argument 2: type mismatch, expected number but got string', 'E1210: Number required for argument 2'])
 enddef
 
 def Test_writefile()
-  v9.CheckDefExecAndScriptFailure(['writefile(["a"], "")'], 'E482: Can''t create file <empty>')
+  v9.CheckSourceDefExecAndScriptFailure(['writefile(["a"], "")'], 'E482: Can''t create file <empty>')
 enddef
 
 def Test_passing_type_to_builtin()
@@ -5047,7 +5047,7 @@
     x = string(T)
     x = instanceof(C.new(), U, C)
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckSourceScriptSuccess(lines)
 
   # check argument to add at script level
   # Note: add() is special cased in compile_call in vim9expr
@@ -5057,7 +5057,7 @@
     endclass
     add([], C)
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check argument to add in :def
   lines =<< trim END
@@ -5069,7 +5069,7 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to add at script level
   lines =<< trim END
@@ -5078,7 +5078,7 @@
     endclass
     []->add(C)
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to add in :def
   lines =<< trim END
@@ -5090,7 +5090,7 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # Try "empty()" builtin
   # check argument to empty at script level
@@ -5100,7 +5100,7 @@
     endclass
     empty(C)
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check argument to empty in :def
   lines =<< trim END
@@ -5112,7 +5112,7 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to empty at script level
   lines =<< trim END
@@ -5121,7 +5121,7 @@
     endclass
     C->empty()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to empty in :def
   lines =<< trim END
@@ -5133,7 +5133,7 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # Try "abs()" builtin
   # check argument to abs at script level
@@ -5143,7 +5143,7 @@
     endclass
     abs(C)
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check argument to abs in :def
   lines =<< trim END
@@ -5155,7 +5155,7 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to abs at script level
   lines =<< trim END
@@ -5164,7 +5164,7 @@
     endclass
     C->abs()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 
   # check member call argument to abs in :def
   lines =<< trim END
@@ -5176,15 +5176,15 @@
     enddef
     F()
   END
-  v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
+  v9.CheckSourceScriptFailure(lines, 'E1405: Class "C" cannot be used as a value')
 enddef
 
 def Test_getregion()
   assert_equal(['x'], getregion(getpos('.'), getpos('.'))->map((_, _) => 'x'))
 
-  v9.CheckDefAndScriptFailure(['getregion(10, getpos("."))'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
+  v9.CheckSourceDefAndScriptFailure(['getregion(10, getpos("."))'], ['E1013: Argument 1: type mismatch, expected list<any> but got number', 'E1211: List required for argument 1'])
   assert_equal([''], getregion(getpos('.'), getpos('.')))
-  v9.CheckDefExecFailure(['getregion(getpos("a"), getpos("."))'], 'E1209:')
+  v9.CheckSourceDefExecFailure(['getregion(getpos("a"), getpos("."))'], 'E1209:')
 enddef
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker
diff --git a/src/testdir/test_winfixbuf.vim b/src/testdir/test_winfixbuf.vim
index 4ee674f..f800338 100644
--- a/src/testdir/test_winfixbuf.vim
+++ b/src/testdir/test_winfixbuf.vim
@@ -2776,11 +2776,11 @@
   call s:make_buffer_pairs()
 
   set winfixbuf
-  call assert_fails("edit something_else", "E1513")
+  call assert_fails("edit something_else", "E1513:")
 
   set nowinfixbuf
   set wfb
-  call assert_fails("edit another_place", "E1513")
+  call assert_fails("edit another_place", "E1513:")
 
   set nowfb
   edit last_place
diff --git a/src/testdir/vim9.vim b/src/testdir/vim9.vim
index 764b611..ff4db7b 100644
--- a/src/testdir/vim9.vim
+++ b/src/testdir/vim9.vim
@@ -110,46 +110,6 @@
   endtry
 enddef
 
-# :source a list of "lines" and check whether it fails with "error"
-export def CheckSourceFailure(lines: list<string>, error: string, lnum = -3)
-  var cwd = getcwd()
-  new
-  setline(1, lines)
-  try
-    assert_fails('source', error, lines, lnum)
-  finally
-    chdir(cwd)
-    bw!
-  endtry
-enddef
-
-# :source a list of "lines" and check whether it fails with the list of
-# "errors"
-export def CheckSourceFailureList(lines: list<string>, errors: list<string>, lnum = -3)
-  var cwd = getcwd()
-  new
-  setline(1, lines)
-  try
-    assert_fails('source', errors, lines, lnum)
-  finally
-    chdir(cwd)
-    bw!
-  endtry
-enddef
-
-# :source a list of "lines" and check whether it succeeds
-export def CheckSourceSuccess(lines: list<string>)
-  var cwd = getcwd()
-  new
-  setline(1, lines)
-  try
-    :source
-  finally
-    chdir(cwd)
-    bw!
-  endtry
-enddef
-
 export def CheckDefAndScriptSuccess(lines: list<string>)
   CheckDefSuccess(lines)
   CheckScriptSuccess(['vim9script'] + lines)
@@ -313,3 +273,177 @@
   CheckDefExecFailure(vim9lines, defError)
   CheckScriptFailure(['vim9script'] + vim9lines, scriptError)
 enddef
+
+# :source a list of "lines" and check whether it fails with "error"
+export def CheckSourceScriptFailure(lines: list<string>, error: string, lnum = -3)
+  var cwd = getcwd()
+  new
+  setline(1, lines)
+  var bnr = bufnr()
+  try
+    assert_fails('source', error, lines, lnum)
+  finally
+    chdir(cwd)
+    exe $':bw! {bnr}'
+  endtry
+enddef
+
+# :source a list of "lines" and check whether it fails with the list of
+# "errors"
+export def CheckSourceScriptFailureList(lines: list<string>, errors: list<string>, lnum = -3)
+  var cwd = getcwd()
+  new
+  var bnr = bufnr()
+  setline(1, lines)
+  try
+    assert_fails('source', errors, lines, lnum)
+  finally
+    chdir(cwd)
+    exe $':bw! {bnr}'
+  endtry
+enddef
+
+# :source a list of "lines" and check whether it succeeds
+export def CheckSourceScriptSuccess(lines: list<string>)
+  var cwd = getcwd()
+  new
+  var bnr = bufnr()
+  setline(1, lines)
+  try
+    :source
+  finally
+    chdir(cwd)
+    exe $':bw! {bnr}'
+  endtry
+enddef
+
+export def CheckSourceSuccess(lines: list<string>)
+  CheckSourceScriptSuccess(lines)
+enddef
+
+export def CheckSourceFailure(lines: list<string>, error: string, lnum = -3)
+  CheckSourceScriptFailure(lines, error, lnum)
+enddef
+
+export def CheckSourceFailureList(lines: list<string>, errors: list<string>, lnum = -3)
+  CheckSourceScriptFailureList(lines, errors, lnum)
+enddef
+
+# :source a List of "lines" inside a ":def" function and check that no error
+# occurs when called.
+export func CheckSourceDefSuccess(lines)
+  let cwd = getcwd()
+  new
+  let bnr = bufnr()
+  call setline(1, ['def Func()'] + a:lines + ['enddef', 'defcompile'])
+  try
+    source
+    call Func()
+  finally
+    call chdir(cwd)
+    delfunc! Func
+    exe $'bw! {bnr}'
+  endtry
+endfunc
+
+export def CheckSourceDefAndScriptSuccess(lines: list<string>)
+  CheckSourceDefSuccess(lines)
+  CheckSourceScriptSuccess(['vim9script'] + lines)
+enddef
+
+# Check that "lines" inside a ":def" function has no error when compiled.
+export func CheckSourceDefCompileSuccess(lines)
+  let cwd = getcwd()
+  new
+  let bnr = bufnr()
+  call setline(1, ['def Func()', '# comment'] + a:lines + ['#comment', 'enddef', 'defcompile'])
+  try
+    source
+  finally
+    call chdir(cwd)
+    delfunc! Func
+    exe $':bw! {bnr}'
+  endtry
+endfunc
+
+# Check that "lines" inside ":def" results in an "error" message.
+# If "lnum" is given check that the error is reported for this line.
+# Add a line before and after to make it less likely that the line number is
+# accidentally correct.
+export func CheckSourceDefFailure(lines, error, lnum = -3)
+  let cwd = getcwd()
+  new
+  let bnr = bufnr()
+  call setline(1, ['def Func()', '# comment'] + a:lines + ['#comment', 'enddef', 'defcompile'])
+  try
+    call assert_fails('source', a:error, a:lines, a:lnum + 1)
+  finally
+    call chdir(cwd)
+    delfunc! Func
+    exe $':bw! {bnr}'
+  endtry
+endfunc
+
+# Check that "lines" inside ":def" results in an "error" message when executed.
+# If "lnum" is given check that the error is reported for this line.
+# Add a line before and after to make it less likely that the line number is
+# accidentally correct.
+export func CheckSourceDefExecFailure(lines, error, lnum = -3)
+  let cwd = getcwd()
+  new
+  let bnr = bufnr()
+  call setline(1, ['def Func()', '# comment'] + a:lines + ['#comment', 'enddef'])
+  try
+    source
+    call assert_fails('call Func()', a:error, a:lines, a:lnum + 1)
+  finally
+    call chdir(cwd)
+    delfunc! Func
+    exe $':bw! {bnr}'
+  endtry
+endfunc
+
+# Check that a command fails when used in a :def function and when used in
+# Vim9 script.
+# When "error" is a string, both with the same error.
+# When "error" is a list, the :def function fails with "error[0]" , the script
+# fails with "error[1]".
+export def CheckSourceDefAndScriptFailure(lines: list<string>, error: any, lnum = -3)
+  var errorDef: string
+  var errorScript: string
+  if type(error) == v:t_string
+    errorDef = error
+    errorScript = error
+  elseif type(error) == v:t_list && len(error) == 2
+    errorDef = error[0]
+    errorScript = error[1]
+  else
+    echoerr 'error argument must be a string or a list with two items'
+    return
+  endif
+  CheckSourceDefFailure(lines, errorDef, lnum)
+  CheckSourceScriptFailure(['vim9script'] + lines, errorScript, lnum + 1)
+enddef
+
+# Check that a command fails when executed in a :def function and when used in
+# Vim9 script.
+# When "error" is a string, both with the same error.
+# When "error" is a list, the :def function fails with "error[0]" , the script
+# fails with "error[1]".
+export def CheckSourceDefExecAndScriptFailure(lines: list<string>, error: any, lnum = -3)
+  var errorDef: string
+  var errorScript: string
+  if type(error) == v:t_string
+    errorDef = error
+    errorScript = error
+  elseif type(error) == v:t_list && len(error) == 2
+    errorDef = error[0]
+    errorScript = error[1]
+  else
+    echoerr 'error argument must be a string or a list with two items'
+    return
+  endif
+  CheckSourceDefExecFailure(lines, errorDef, lnum)
+  CheckSourceScriptFailure(['vim9script'] + lines, errorScript, lnum + 1)
+enddef
+
diff --git a/src/version.c b/src/version.c
index 5f931ce..c67ee48 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    364,
+/**/
     363,
 /**/
     362,