diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 3ea3a0b..a644e17 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1717,7 +1717,7 @@
 let $TESTVAR = 'testvar'
 
 " type casts
-def Test_expr7t()
+def Test_expr7()
   var lines =<< trim END
       var ls: list<string> = ['a', <string>g:string_empty]
       var ln: list<number> = [<number>g:anint, <number>g:thefour]
@@ -1743,7 +1743,7 @@
 enddef
 
 " test low level expression
-def Test_expr7_number()
+def Test_expr8_number()
   # number constant
   var lines =<< trim END
       assert_equal(0, 0)
@@ -1756,7 +1756,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_float()
+def Test_expr8_float()
   # float constant
   if !has('float')
     MissingFeature 'float'
@@ -1771,7 +1771,7 @@
   endif
 enddef
 
-def Test_expr7_blob()
+def Test_expr8_blob()
   # blob constant
   var lines =<< trim END
       assert_equal(g:blob_empty, 0z)
@@ -1803,7 +1803,7 @@
   CheckDefAndScriptFailure(["var x = 0z123"], 'E973:', 1)
 enddef
 
-def Test_expr7_string()
+def Test_expr8_string()
   # string constant
   var lines =<< trim END
       assert_equal(g:string_empty, '')
@@ -1820,7 +1820,7 @@
   CheckDefAndScriptFailure(["var x = 'abc"], 'E115:', 1)
 enddef
 
-def Test_expr7_vimvar()
+def Test_expr8_vimvar()
   v:errors = []
   var errs: list<string> = v:errors
   CheckDefFailure(['var errs: list<number> = v:errors'], 'E1012:')
@@ -1845,7 +1845,7 @@
   bwipe!
 enddef
 
-def Test_expr7_special()
+def Test_expr8_special()
   # special constant
   var lines =<< trim END
       assert_equal(g:special_true, true)
@@ -1882,7 +1882,7 @@
   CheckDefAndScriptFailure(['v:none = 22'], 'E46:', 1)
 enddef
 
-def Test_expr7_list()
+def Test_expr8_list()
   # list
   var lines =<< trim END
       assert_equal(g:list_empty, [])
@@ -1955,7 +1955,7 @@
   CheckDefAndScriptFailure(lines + ['echo numbers[a :b]'], 'E1004:', 4)
 enddef
 
-def Test_expr7_list_vim9script()
+def Test_expr8_list_vim9script()
   var lines =<< trim END
       var l = [
 		11,
@@ -2043,7 +2043,7 @@
             x == 2
 enddef
 
-def Test_expr7_lambda()
+def Test_expr8_lambda()
   var lines =<< trim END
       var La = () => 'result'
       # comment
@@ -2129,7 +2129,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_lambda_block()
+def Test_expr8_lambda_block()
   var lines =<< trim END
       var Func = (s: string): string => {
                       return 'hello ' .. s
@@ -2209,7 +2209,7 @@
             x == 2
 enddef
 
-def Test_expr7_new_lambda()
+def Test_expr8_new_lambda()
   var lines =<< trim END
       var La = () => 'result'
       assert_equal('result', La())
@@ -2294,7 +2294,7 @@
   CheckDefAndScriptFailure(['var Fx = (a) => [0', ' 1]'], 'E696:', 2)
 enddef
 
-def Test_expr7_lambda_vim9script()
+def Test_expr8_lambda_vim9script()
   var lines =<< trim END
       var v = 10->((a) =>
 	    a
@@ -2313,7 +2313,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_funcref()
+def Test_expr8_funcref()
   var lines =<< trim END
       def RetNumber(): number
         return 123
@@ -2350,7 +2350,7 @@
 let g:test_space_dict = {'': 'empty', ' ': 'space'}
 let g:test_hash_dict = #{one: 1, two: 2}
 
-def Test_expr7_dict()
+def Test_expr8_dict()
   # dictionary
   var lines =<< trim END
       assert_equal(g:dict_empty, {})
@@ -2461,7 +2461,7 @@
   CheckDefExecAndScriptFailure(['{}[getftype("file")]'], 'E716: Key not present in Dictionary: ""', 1)
 enddef
 
-def Test_expr7_dict_vim9script()
+def Test_expr8_dict_vim9script()
   var lines =<< trim END
       var d = {
 		['one']:
@@ -2592,7 +2592,7 @@
   CheckScriptSuccess(lines)
 enddef
 
-def Test_expr7_dict_in_block()
+def Test_expr8_dict_in_block()
   var lines =<< trim END
       vim9script
       command MyCommand {
@@ -2615,7 +2615,7 @@
   delcommand YourCommand
 enddef
 
-def Test_expr7_call_2bool()
+def Test_expr8_call_2bool()
   var lines =<< trim END
       vim9script
 
@@ -2663,7 +2663,7 @@
   CheckDefExecAndScriptFailure(["var d: dict<number>", "d = g:list_empty"], 'E1012: Type mismatch; expected dict<number> but got list<unknown>', 2)
 enddef
 
-def Test_expr7_any_index_slice()
+def Test_expr8_any_index_slice()
   var lines =<< trim END
     # getting the one member should clear the list only after getting the item
     assert_equal('bbb', ['aaa', 'bbb', 'ccc'][1])
@@ -2817,7 +2817,7 @@
   b:someVar = &fdm
 enddef
 
-def Test_expr7_option()
+def Test_expr8_option()
   var lines =<< trim END
       # option
       set ts=11
@@ -2844,7 +2844,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_environment()
+def Test_expr8_environment()
   var lines =<< trim END
       # environment variable
       assert_equal('testvar', $TESTVAR)
@@ -2856,7 +2856,7 @@
   CheckDefAndScriptFailure(["$"], ['E1002:', 'E15:'], 1)
 enddef
 
-def Test_expr7_register()
+def Test_expr8_register()
   var lines =<< trim END
       @a = 'register a'
       assert_equal('register a', @a)
@@ -2882,7 +2882,7 @@
 enddef
 
 " This is slow when run under valgrind.
-def Test_expr7_namespace()
+def Test_expr8_namespace()
   var lines =<< trim END
       g:some_var = 'some'
       assert_equal('some', get(g:, 'some_var'))
@@ -2911,7 +2911,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_namespace_loop_def()
+def Test_expr8_namespace_loop_def()
   var lines =<< trim END
       # check using g: in a for loop more than DO_NOT_FREE_CNT times
       var exists = 0
@@ -2930,8 +2930,8 @@
 enddef
 
 " NOTE: this is known to be slow.  To skip use:
-"   :let $TEST_SKIP_PAT = 'Test_expr7_namespace_loop_script'
-def Test_expr7_namespace_loop_script()
+"   :let $TEST_SKIP_PAT = 'Test_expr8_namespace_loop_script'
+def Test_expr8_namespace_loop_script()
   var lines =<< trim END
       vim9script
       # check using g: in a for loop more than DO_NOT_FREE_CNT times
@@ -2950,7 +2950,7 @@
   CheckScriptSuccess(lines)
 enddef
 
-def Test_expr7_parens()
+def Test_expr8_parens()
   # (expr)
   var lines =<< trim END
       assert_equal(4, (6 * 4) / 6)
@@ -2982,7 +2982,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_negate_add()
+def Test_expr8_negate_add()
   var lines =<< trim END
       assert_equal(-99, -99)
       assert_equal(-99, - 99)
@@ -3031,7 +3031,7 @@
   legacy return #{key: 'ok'}.key
 enddef
 
-def Test_expr7_legacy_script()
+def Test_expr8_legacy_script()
   var lines =<< trim END
       let s:legacy = 'legacy'
       def GetLocal(): string
@@ -3065,7 +3065,7 @@
   return arg
 enddef
 
-def Test_expr7_call()
+def Test_expr8_call()
   var lines =<< trim END
       assert_equal('yes', 'yes'->Echo())
       assert_equal(true, !range(5)->empty())
@@ -3098,7 +3098,7 @@
   delete('Xruntime', 'rf')
 enddef
 
-def Test_expr7_method_call()
+def Test_expr8_method_call()
   var lines =<< trim END
       new
       setline(1, ['first', 'last'])
@@ -3175,7 +3175,7 @@
   CheckDefExecFailure(lines, 'E1013:')
 enddef
 
-def Test_expr7_method_call_linebreak()
+def Test_expr8_method_call_linebreak()
   # this was giving an error when skipping over the expression
   var lines =<< trim END
       vim9script
@@ -3191,8 +3191,34 @@
   CheckScriptSuccess(lines)
 enddef
 
+def Test_expr8_method_call_import()
+  var lines =<< trim END
+      vim9script
+      export def Square(items: list<number>): list<number>
+          return map(items, (_, i) => i * i)
+      enddef
+  END
+  call writefile(lines, 'Xsquare.vim')
 
-def Test_expr7_not()
+  lines =<< trim END
+      vim9script
+      import './Xsquare.vim'
+
+      def Test(): list<number>
+        return range(5)
+            ->Xsquare.Square()
+            ->map((_, i) => i * 10)
+      enddef
+
+      assert_equal([0, 10, 40, 90, 160], Test())
+  END
+  CheckScriptSuccess(lines)
+
+  delete('Xsquare.vim')
+enddef
+
+
+def Test_expr8_not()
   var lines =<< trim END
       assert_equal(true, !'')
       assert_equal(true, ![])
@@ -3244,7 +3270,7 @@
 
 let g:anumber = 42
 
-def Test_expr7_negate()
+def Test_expr8_negate()
   var lines =<< trim END
       var nr = 1
       assert_equal(-1, -nr)
@@ -3253,7 +3279,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-func Test_expr7_fails()
+func Test_expr8_fails()
   call CheckDefFailure(["var x = (12"], "E1097:", 3)
   call CheckScriptFailure(['vim9script', "var x = (12"], 'E110:', 2)
 
@@ -3313,7 +3339,7 @@
   return a:one .. a:two
 endfunc
 
-def Test_expr7_trailing()
+def Test_expr8_trailing()
   var lines =<< trim END
       # user function call
       assert_equal(123, g:CallMe(123))
@@ -3349,7 +3375,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_string_subscript()
+def Test_expr8_string_subscript()
   var lines =<< trim END
     var text = 'abcdef'
     assert_equal('f', text[-1])
@@ -3448,7 +3474,7 @@
   CheckDefAndScriptFailure(lines, ['E1012: Type mismatch; expected number but got string', 'E1030: Using a String as a Number: "2"'], 1)
 enddef
 
-def Test_expr7_list_subscript()
+def Test_expr8_list_subscript()
   var lines =<< trim END
       var list = [0, 1, 2, 3, 4]
       assert_equal(0, list[0])
@@ -3491,7 +3517,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_dict_subscript()
+def Test_expr8_dict_subscript()
   var lines =<< trim END
       var l = [{lnum: 2}, {lnum: 1}]
       var res = l[0].lnum > l[1].lnum
@@ -3512,7 +3538,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_blob_subscript()
+def Test_expr8_blob_subscript()
   var lines =<< trim END
       var b = 0z112233
       assert_equal(0x11, b[0])
@@ -3524,7 +3550,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_expr7_subscript_linebreak()
+def Test_expr8_subscript_linebreak()
   var lines =<< trim END
       var range = range(
                     3)
@@ -3567,7 +3593,7 @@
   CheckDefAndScriptFailure(lines, ['E1127:', 'E116:'], 2)
 enddef
 
-func Test_expr7_trailing_fails()
+func Test_expr8_trailing_fails()
   call CheckDefAndScriptFailure(['var l = [2]', 'l->((ll) => add(ll, 8))'], 'E107:', 2)
   call CheckDefAndScriptFailure(['var l = [2]', 'l->((ll) => add(ll, 8)) ()'], 'E274:', 2)
 endfunc
diff --git a/src/version.c b/src/version.c
index dbbf7d7..7657cf5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4124,
+/**/
     4123,
 /**/
     4122,
diff --git a/src/vim9expr.c b/src/vim9expr.c
index 4c39578..922c7ba 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -1732,21 +1732,23 @@
 		}
 		else
 		{
+		    int fail;
+		    int save_len = cctx->ctx_ufunc->uf_lines.ga_len;
+
 		    *paren = NUL;
-		    if (compile_expr8(arg, cctx, ppconst) == FAIL
-						    || *skipwhite(*arg) != NUL)
+		    // do not look in the next line
+		    cctx->ctx_ufunc->uf_lines.ga_len = 1;
+		    fail = compile_expr8(arg, cctx, ppconst) == FAIL
+						    || *skipwhite(*arg) != NUL;
+		    *paren = '(';
+		    cctx->ctx_ufunc->uf_lines.ga_len = save_len;
+		    if (fail)
 		    {
-			*paren = '(';
 			semsg(_(e_invalid_expression_str), pstart);
 			return FAIL;
 		    }
-		    *paren = '(';
 		}
 
-		// Remember the next instruction index, where the instructions
-		// for arguments are being written.
-		expr_isn_end = cctx->ctx_instr.ga_len;
-
 		// Compile the arguments.
 		if (**arg != '(')
 		{
@@ -1756,6 +1758,11 @@
 			semsg(_(e_missing_parenthesis_str), *arg);
 		    return FAIL;
 		}
+
+		// Remember the next instruction index, where the instructions
+		// for arguments are being written.
+		expr_isn_end = cctx->ctx_instr.ga_len;
+
 		*arg = skipwhite(*arg + 1);
 		if (compile_arguments(arg, cctx, &argcount, FALSE) == FAIL)
 		    return FAIL;