From 1dddc2f712f774b22a8f65432299cebb3b26361b Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 30 May 2018 17:05:05 +0900
Subject: Clear `__classname__` of duped class/module; ref #4027

---
 src/kernel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/kernel.c')

diff --git a/src/kernel.c b/src/kernel.c
index e9dc93bbd..8551b50ea 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -282,7 +282,9 @@ init_copy(mrb_state *mrb, mrb_value dest, mrb_value obj)
     case MRB_TT_CLASS:
     case MRB_TT_MODULE:
       copy_class(mrb, dest, obj);
-      /* fall through */
+      mrb_iv_copy(mrb, dest, obj);
+      mrb_iv_remove(mrb, dest, mrb_intern_lit(mrb, "__classname__"));
+      break;
     case MRB_TT_OBJECT:
     case MRB_TT_SCLASS:
     case MRB_TT_HASH:
-- 
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