patch 8.2.3336: behavior of negative index in list change changed
Problem: Behavior of negative index in list change changed. (Naruhiko
Nishino)
Solution: Only change it for Vim9 script. (closes #8749)
diff --git a/src/list.c b/src/list.c
index 9d07b7e..04ddbfc 100644
--- a/src/list.c
+++ b/src/list.c
@@ -1146,15 +1146,19 @@
n1 = len + n1;
if (n1 < 0 || n1 >= len)
{
- // For a range we allow invalid values and return an empty
- // list. A list index out of range is an error.
+ // For a range we allow invalid values and for legacy script return an
+ // empty list, for Vim9 script start at the first item.
+ // A list index out of range is an error.
if (!range)
{
if (verbose)
semsg(_(e_listidx), (long)n1_arg);
return FAIL;
}
- n1 = n1 < 0 ? 0 : len;
+ if (in_vim9script())
+ n1 = n1 < 0 ? 0 : len;
+ else
+ n1 = len;
}
if (range)
{