Patch 8.2.2252
Problem:    Vim9: crash when using lambda without return type in dict.
Solution:   Without a return type use t_unknown. (closes #7587)
Files:      src/vim9type.c, src/vim9compile.c, src/testdir/test_vim9_expr.vim


*** ../vim-8.2.2251/src/vim9type.c      2020-12-26 20:09:11.282465257 +0100
--- src/vim9type.c      2020-12-31 13:13:41.001169456 +0100
***************
*** 480,486 ****
        }
        else if (expected->tt_type == VAR_FUNC)
        {
!           if (expected->tt_member != &t_unknown)
                ret = check_type(expected->tt_member, actual->tt_member,
                                                                     FALSE, 0);
            if (ret == OK && expected->tt_argcount != -1
--- 480,489 ----
        }
        else if (expected->tt_type == VAR_FUNC)
        {
!           // If the return type is unknown it can be anything, including
!           // nothing, thus there is no point in checking.
!           if (expected->tt_member != &t_unknown
!                                           && actual->tt_member != &t_unknown)
                ret = check_type(expected->tt_member, actual->tt_member,
                                                                     FALSE, 0);
            if (ret == OK && expected->tt_argcount != -1
*** ../vim-8.2.2251/src/vim9compile.c   2020-12-30 20:39:17.450007607 +0100
--- src/vim9compile.c   2020-12-31 13:29:59.541798974 +0100
***************
*** 4837,4843 ****
        if (cctx->ctx_skip != SKIP_YES)
        {
            stack_type = ((type_T **)stack->ga_data)[stack->ga_len - 1];
!           if (check_return_type && cctx->ctx_ufunc->uf_ret_type == NULL)
            {
                cctx->ctx_ufunc->uf_ret_type = stack_type;
            }
--- 4837,4844 ----
        if (cctx->ctx_skip != SKIP_YES)
        {
            stack_type = ((type_T **)stack->ga_data)[stack->ga_len - 1];
!           if (check_return_type && (cctx->ctx_ufunc->uf_ret_type == NULL
!                               || cctx->ctx_ufunc->uf_ret_type == &t_unknown))
            {
                cctx->ctx_ufunc->uf_ret_type = stack_type;
            }
*** ../vim-8.2.2251/src/testdir/test_vim9_expr.vim      2020-12-30 
20:39:17.454007601 +0100
--- src/testdir/test_vim9_expr.vim      2020-12-31 13:08:29.366103323 +0100
***************
*** 2077,2082 ****
--- 2077,2086 ----
        assert_equal(g:test_hash_dict, {one: 1, two: 2})
  
        assert_equal({['a a']: 1, ['b/c']: 2}, {'a a': 1, "b/c": 2})
+ 
+       var d = {a: () => 3, b: () => 7}
+       assert_equal(3, d.a())
+       assert_equal(7, d.b())
    END
    CheckDefAndScriptSuccess(lines)
   
*** ../vim-8.2.2251/src/version.c       2020-12-30 21:16:27.727686851 +0100
--- src/version.c       2020-12-31 13:07:35.894249182 +0100
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     2252,
  /**/

-- 
ERROR 047: Keyboard not found.  Press RETURN to continue.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
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