From b64ce17852b180dfeea81cf458660be41a78974d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 30 May 2018 17:05:40 +0900
Subject: Should not call `initialize_copy` for `TT_ICLASS`; fix #4027

Since `TT_ICLASS` is a internal object that should never be revealed
to Ruby world.
---
 src/kernel.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/kernel.c')

diff --git a/src/kernel.c b/src/kernel.c
index 8551b50ea..2a50d3126 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -279,6 +279,9 @@ static void
 init_copy(mrb_state *mrb, mrb_value dest, mrb_value obj)
 {
   switch (mrb_type(obj)) {
+    case MRB_TT_ICLASS:
+      copy_class(mrb, dest, obj);
+      return;
     case MRB_TT_CLASS:
     case MRB_TT_MODULE:
       copy_class(mrb, dest, obj);
-- 
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