From 2b9e5e751b4d6d1a86eb25b2a4e40f9c8d19c06c Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 13 Aug 2014 22:55:32 +0900
Subject: add write barrier when iv is copied

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

diff --git a/src/variable.c b/src/variable.c
index 2cd185434..a50256353 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -553,6 +553,7 @@ mrb_iv_copy(mrb_state *mrb, mrb_value dest, mrb_value src)
     d->iv = 0;
   }
   if (s->iv) {
+    mrb_write_barrier(mrb, (struct RBasic*)d);
     d->iv = iv_copy(mrb, s->iv);
   }
 }
-- 
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