From e4e37406884970b85dd8f2261f696aca292ccfcf Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 27 May 2023 16:42:25 +0900
Subject: [PATCH] class.c (init_copy): add an assertion

---
 src/class.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/class.c b/src/class.c
index 2cded3256..d36e36394 100644
--- a/src/class.c
+++ b/src/class.c
@@ -2737,6 +2737,7 @@ mrb_obj_init_copy(mrb_state *mrb, mrb_value self)
 static void
 init_copy(mrb_state *mrb, mrb_value dest, mrb_value obj)
 {
+  mrb_assert((mrb_type(dest) == mrb_type(obj)));
   switch (mrb_type(obj)) {
     case MRB_TT_ICLASS:
       copy_class(mrb, dest, obj);