commit 6b55377303968e1624339cd95053201d5acdcaa2
author Bram Moolenaar <Bram@vim.org> Thu Dec 31 13:31:23 2020 +0100
committer Bram Moolenaar <Bram@vim.org> Thu Dec 31 13:31:23 2020 +0100
tree 6c0410ba3927ae81ac9a53bc2d1002c3aa7015d0
parent a04d447d3aaddb5b978dd9a0e0186007fde8e09e

patch 8.2.2252: Vim9: crash when using lambda without return type in dict

Problem:    Vim9: crash when using lambda without return type in dict.
Solution:   Without a return type use t_unknown. (closes #7587)

src/vim9compile.c

diff --git a/src/vim9compile.c b/src/vim9compile.c
index 6ef2b5e..5602ff5 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -4837,7 +4837,8 @@
 	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)
+	    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;
 	    }