From 1729243bba6e3bab8001c3f96bff0aeca47ed9ae Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 21 Dec 2016 11:12:39 +0000
Subject: eval.c: fix circular cause

* eval.c (exc_setup_cause): always set cause of cause to get rid
  of circular references.  [ruby-core:78688] [Bug #13043]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57137 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 eval.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index 178ff62137..4c6e8e98b4 100644
--- a/eval.c
+++ b/eval.c
@@ -457,6 +457,9 @@ exc_setup_cause(VALUE exc, VALUE cause)
 #endif
     if (!NIL_P(cause) && cause != exc) {
 	rb_ivar_set(exc, id_cause, cause);
+	if (!rb_ivar_defined(cause, id_cause)) {
+	    rb_ivar_set(cause, id_cause, Qnil);
+	}
     }
     return exc;
 }
-- 
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