From 57ffa1c1508f01434806b1b7301f4ae982eb9ae0 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 27 May 2017 18:40:15 +0900
Subject: Avoid unsharing env when context (mrb->c) differs; ref #3668

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

(limited to 'src/vm.c')

diff --git a/src/vm.c b/src/vm.c
index ce5ee9384..3d1433704 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -264,6 +264,7 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
   mrb_value *p;
 
   if (!MRB_ENV_STACK_SHARED_P(e)) return;
+  if (e->cxt.c != mrb->c) return;
   if (e->cioff == 0 && e->cxt.c == mrb->root_c) return;
   MRB_ENV_UNSHARE_STACK(e);
   if (!e->c) {
-- 
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