From 059d707e3a2f5e3e528ec7249090b17a3c7de4d9 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 12 Jul 2017 14:44:36 +0900
Subject: Add `ary_modify_check()` to `Array#unshift`; ref #3737

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

(limited to 'src/array.c')

diff --git a/src/array.c b/src/array.c
index f3d29faec..2e8cf1116 100644
--- a/src/array.c
+++ b/src/array.c
@@ -533,6 +533,7 @@ mrb_ary_unshift_m(mrb_state *mrb, mrb_value self)
   if (ARY_SHARED_P(a)
       && a->aux.shared->refcnt == 1 /* shared only referenced from this array */
       && a->ptr - a->aux.shared->ptr >= len) /* there's room for unshifted item */ {
+    ary_modify_check(mrb, a);
     a->ptr -= len;
   }
   else {
-- 
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