From bd6b48fa3b352bbcb97463dcb95e30db37bff2e4 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 1 Feb 2021 14:33:28 +0900
Subject: Copy `iv` table with `#prepend`; fix #5309

In addition, stop eager allocation of `mt` table.
---
 src/class.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/class.c')

diff --git a/src/class.c b/src/class.c
index ac8cf423e..09e52d24a 100644
--- a/src/class.c
+++ b/src/class.c
@@ -1497,7 +1497,8 @@ mrb_prepend_module(mrb_state *mrb, struct RClass *c, struct RClass *m)
     origin->super = c->super;
     c->super = origin;
     origin->mt = c->mt;
-    c->mt = mt_new(mrb);
+    c->mt = NULL;
+    origin->iv = c->iv;
     mrb_field_write_barrier(mrb, (struct RBasic*)c, (struct RBasic*)origin);
     c->flags |= MRB_FL_CLASS_IS_PREPENDED;
   }
-- 
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