From 1f29e8e2baa548bba9e385ebbade2198b4cc3859 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 21 Feb 2014 11:42:03 +0000
Subject: class.c: do nothing if copying self

* class.c (rb_mod_init_copy): do nothing if copying self.
  [ruby-dev:47989] [Bug #9535]
* hash.c (rb_hash_initialize_copy): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/zlib/zlib.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'ext/zlib/zlib.c')

diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index c0f52c23cc..824dd1324a 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -1563,6 +1563,7 @@ rb_deflate_init_copy(VALUE self, VALUE orig)
     Data_Get_Struct(self, struct zstream, z1);
     z2 = get_zstream(orig);
 
+    if (z1 == z2) return self;
     err = deflateCopy(&z1->stream, &z2->stream);
     if (err != Z_OK) {
 	raise_zlib_error(err, 0);
-- 
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