patch 8.2.4384: Vim9: error message not tested, some code not tested

Problem:    Vim9: error message not tested, some code not tested.
Solution:   Add a couple of test cases.  Give an error for a command modifier
            without a command.
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index d9b8f3a..8a00ceb 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -350,6 +350,11 @@
     assert_equal(1, v1)
     assert_equal(2, v2)
 
+    var _x: number
+    [_x, v2] = [6, 7]
+    assert_equal(6, _x)
+    assert_equal(7, v2)
+
     var reslist = []
     for text in ['aaa {bbb} ccc', 'ddd {eee} fff']
       var before: string
@@ -1481,6 +1486,7 @@
 
   v9.CheckDefFailure(["var d: dict<number> = {a: '', b: true}"], 'E1012: Type mismatch; expected dict<number> but got dict<any>', 1)
   v9.CheckDefFailure(["var d: dict<dict<number>> = {x: {a: '', b: true}}"], 'E1012: Type mismatch; expected dict<dict<number>> but got dict<dict<any>>', 1)
+  v9.CheckDefFailure(["var d = {x: 1}", "d[1 : 2] = {y: 2}"], 'E1165: Cannot use a range with an assignment: d[1 : 2] =', 2)
 enddef
 
 def Test_assign_dict_unknown_type()
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 8325d7a..f80d5a2 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -1133,6 +1133,16 @@
       silent endtry
   END
   v9.CheckDefAndScriptFailure(lines, 'E1176:', 3)
+
+  lines =<< trim END
+      leftabove
+  END
+  v9.CheckDefAndScriptFailure(lines, 'E1082:', 1)
+
+  lines =<< trim END
+      leftabove # comment
+  END
+  v9.CheckDefAndScriptFailure(lines, 'E1082:', 1)
 enddef
 
 def Test_eval_command()