commit 9b123d859053ad1fb91d38334726b9f24da39930
author Bram Moolenaar <Bram@vim.org> Mon Sep 14 22:39:11 2020 +0200
committer Bram Moolenaar <Bram@vim.org> Mon Sep 14 22:39:11 2020 +0200
tree 543fd4e6d63b59761146211250846ec4288750d9
parent 71abe4828974af495602ffaff63cf643a16de84b

patch 8.2.1687: Vim9: out of bounds error

Problem:    Vim9: out of bounds error.
Solution:   Check that cmdidx is not negative.

src/vim9compile.c

diff --git a/src/vim9compile.c b/src/vim9compile.c
index e8a3a21..a53f05d 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -6903,7 +6903,8 @@
 	if (ea.cmdidx != CMD_SIZE
 			    && ea.cmdidx != CMD_write && ea.cmdidx != CMD_read)
 	{
-	    ea.argt = excmd_get_argt(ea.cmdidx);
+	    if (ea.cmdidx >= 0)
+		ea.argt = excmd_get_argt(ea.cmdidx);
 	    if ((ea.argt & EX_BANG) && *p == '!')
 	    {
 		ea.forceit = TRUE;