From 8b3298b2d699e7affbc326a1d67e9004e0e5c4ce Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 19 Aug 2017 11:08:46 +0900
Subject: Unshift pointer move size was wrong (not `len` but `alen`); fix #3780

---
 src/array.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/array.c')

diff --git a/src/array.c b/src/array.c
index 0360f2177..cec08b351 100644
--- a/src/array.c
+++ b/src/array.c
@@ -570,7 +570,7 @@ mrb_ary_unshift_m(mrb_state *mrb, mrb_value self)
       && a->as.heap.aux.shared->refcnt == 1 /* shared only referenced from this array */
       && a->as.heap.ptr - a->as.heap.aux.shared->ptr >= alen) /* there's room for unshifted item */ {
     ary_modify_check(mrb, a);
-    a->as.heap.ptr -= len;
+    a->as.heap.ptr -= alen;
     ptr = a->as.heap.ptr;
   }
   else {
-- 
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