From 4b5b81aab41ec500d766875cc810b6378d8f0129 Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Fri, 19 Mar 2021 13:25:53 +0900
Subject: [PATCH] l.extend(l) needs to make copy

---
 src/obj_list.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/obj_list.c b/src/obj_list.c
index dba95e6..8904470 100644
--- a/src/obj_list.c
+++ b/src/obj_list.c
@@ -132,6 +132,9 @@ KRK_METHOD(list,extend,{
 	METHOD_TAKES_EXACTLY(1);
 	pthread_rwlock_wrlock(&self->rwlock);
 	KrkValueArray *  positionals = AS_LIST(argv[0]);
+	if (krk_valuesSame(argv[0],argv[1])) {
+		argv[1] = krk_list_of(self->values.count, self->values.values, 0);
+	}
 	unpackIterableFast(argv[1]);
 _break_loop:
 	pthread_rwlock_unlock(&self->rwlock);