From b3e05998c80ff12473f2cb5313093d9f354a5750 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 27 Nov 2016 11:07:27 +0000
Subject: object.c: no TypeError at special const dup

* object.c (rb_obj_dup): no longer raise a TypeError for special
  constants, and return itself instead.  [Feature#12979]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56906 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 object.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'object.c')

diff --git a/object.c b/object.c
index 05bef4df28..7075e13683 100644
--- a/object.c
+++ b/object.c
@@ -423,7 +423,7 @@ rb_obj_dup(VALUE obj)
     VALUE dup;
 
     if (rb_special_const_p(obj)) {
-        rb_raise(rb_eTypeError, "can't dup %s", rb_obj_classname(obj));
+	return obj;
     }
     dup = rb_obj_alloc(rb_obj_class(obj));
     init_copy(dup, obj);
-- 
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