patch 8.2.4459: Vim9: compiling sort() call fails with unknown argumentsv8.2.4459

Problem:    Vim9: compiling sort() call fails with a funcref that has unknown
            arguments.
Solution:   Do not check the arguments if they are unknown at compile time.
            (closes #9835)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index dfec991f8d..7577aecd2a 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -3812,6 +3812,17 @@ def Test_sort_argument()
       sort([1, 2, 3], (a: any, b: any) => 1)
   END
   v9.CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+      def SortedList(): list<number>
+        var Lambda: func: number = (a, b): number => a - b
+        var l = [3, 2, 1]
+        return l->sort(Lambda)
+      enddef
+      SortedList()->assert_equal([1, 2, 3])
+  END
+  v9.CheckScriptSuccess(lines)
 enddef
 
 def Test_sort_compare_func_fails()