Patch 8.2.4459
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)
Files:      src/evalfunc.c, src/testdir/test_vim9_builtin.vim


*** ../vim-8.2.4458/src/evalfunc.c      2022-02-23 19:11:44.035997696 +0000
--- src/evalfunc.c      2022-02-23 20:57:56.790561211 +0000
***************
*** 624,629 ****
--- 624,631 ----
            where_T where = WHERE_INIT;
  
            args[1] = args[0];
+           if (type->tt_argcount == -1)
+               t_func_exp.tt_argcount = -1;
            where.wt_index = 2;
            return check_type(&t_func_exp, type, TRUE, where);
        }
*** ../vim-8.2.4458/src/testdir/test_vim9_builtin.vim   2022-02-23 
19:11:44.039997685 +0000
--- src/testdir/test_vim9_builtin.vim   2022-02-23 20:57:05.530766159 +0000
***************
*** 3812,3817 ****
--- 3812,3828 ----
        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()
*** ../vim-8.2.4458/src/version.c       2022-02-23 19:11:44.039997685 +0000
--- src/version.c       2022-02-23 20:58:34.474417165 +0000
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     4459,
  /**/

-- 
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floor -- especially in the dark.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///                                                                      \\\
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