patch 8.2.3056: Vim9: using default value in lambda gives confusing error Commit: https://github.com/vim/vim/commit/14ded11fcad77ebf41032ec80a95d516ca9acb1c Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jun 26 19:25:49 2021 +0200 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)

--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -918,6 +918,12 @@ def Test_call_lambda_args()
   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]