commit 5b73992d8f82be7ac4b6f46c17f53ffb9640e5fa
author Yegappan Lakshmanan <yegappan@yahoo.com> Sat Jul 10 13:15:41 2021 +0200
committer Bram Moolenaar <Bram@vim.org> Sat Jul 10 13:15:41 2021 +0200
tree ff59a04ff0b60de8b527e5fe9d5e7df9bf50f5ce
parent 9da32e4d578f4e93ef5397f9dd13e2c28b2a2595

patch 8.2.3135: Vim9: builtin function arguments not checked at compile time

Problem:    Vim9: builtin function arguments not checked at compile time.
Solution:   Add more type checks. (Yegappan Lakshmanan, closes #8539)

src/terminal.c

diff --git a/src/terminal.c b/src/terminal.c
index e3945d0..9de516c 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -5276,6 +5276,11 @@
     FILE	*fd2 = NULL;
     char_u	*textline = NULL;
 
+    if (in_vim9script()
+	    && (check_for_string_arg(argvars, 0) == FAIL
+		|| check_for_dict_arg(argvars, 1) == FAIL))
+	return;
+
     // First open the files.  If this fails bail out.
     fname1 = tv_get_string_buf_chk(&argvars[0], buf1);
     if (do_diff)