commit 4490ec4e839e45a2e6923c265c7e9e64c240b805
author Yegappan Lakshmanan <yegappan@yahoo.com> Tue Jul 27 22:00:44 2021 +0200
committer Bram Moolenaar <Bram@vim.org> Tue Jul 27 22:00:44 2021 +0200
tree 3ef2dc127890ac6a644f38ae7932b7e70071544a
parent 5d7c2df536c17db4a9c61e0760bdcf78d0db7330

patch 8.2.3229: Vim9: runtime and compile time type checks are not the same

Problem:    Vim9: runtime and compile time type checks are not the same.
Solution:   Add more runtime type checks for builtin functions. (Yegappan
            Lakshmanan, closes #8646)

src/undo.c

diff --git a/src/undo.c b/src/undo.c
index 171e817..8141301 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -3646,6 +3646,9 @@
     void
 f_undofile(typval_T *argvars UNUSED, typval_T *rettv)
 {
+    if (in_vim9script() && check_for_string_arg(argvars, 0) == FAIL)
+	return;
+
     rettv->v_type = VAR_STRING;
 #ifdef FEAT_PERSISTENT_UNDO
     {