commit 14ded11fcad77ebf41032ec80a95d516ca9acb1c
author Bram Moolenaar <Bram@vim.org> Sat Jun 26 19:25:49 2021 +0200
committer Bram Moolenaar <Bram@vim.org> Sat Jun 26 19:25:49 2021 +0200
tree 118966a6ffe086076d68f03244a39286b8a03ee4
parent 3a3b10e87a10dd0bc355618dbfc4a0a6c828aad7

patch 8.2.3056: Vim9: using default value in lambda gives confusing error

Problem:    Vim9: using default value in lambda gives confusing error.
Solution:   Pass "default_args" on the first pass to get the arguments.
            (closes #8455)

src/testdir/test_vim9_func.vim

diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index bffbb1b..ee97e56 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -918,6 +918,12 @@
   CheckScriptFailure(['vim9script'] + lines, 'E1168:')
 
   lines =<< trim END
+    var Ref: func(any, ?any): bool
+    Ref = (_, y = 1) => false
+  END
+  CheckDefAndScriptFailure(lines, 'E1172:')
+
+  lines =<< trim END
       def ShadowLocal()
         var one = 1
         var l = [1, 2, 3]

src/userfunc.c

diff --git a/src/userfunc.c b/src/userfunc.c
index e2e745c..cedd37b 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -1222,7 +1222,7 @@
     s = *arg + 1;
     ret = get_function_args(&s, equal_arrow ? ')' : '-', NULL,
 	    types_optional ? &argtypes : NULL, types_optional, evalarg,
-						 NULL, NULL, TRUE, NULL, NULL);
+					NULL, &default_args, TRUE, NULL, NULL);
     if (ret == FAIL || skip_arrow(s, equal_arrow, &ret_type, NULL) == NULL)
     {
 	if (types_optional)

src/version.c

diff --git a/src/version.c b/src/version.c
index 6d907d5..0858018 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3056,
+/**/
     3055,
 /**/
     3054,