From 38098ddf2aac2928220b41dfb15459bf13ce230b Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 6 Dec 2022 15:45:39 +0900
Subject: [PATCH] class.c (prepare_singleton_class): remove unnecessary write
 barrier

Since sc (singleton class) is a newly created object so it's not needed
to call write barrier.
---
 src/class.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/class.c b/src/class.c
index 8afd792f5..180d66c1a 100644
--- a/src/class.c
+++ b/src/class.c
@@ -392,7 +392,6 @@ prepare_singleton_class(mrb_state *mrb, struct RBasic *o)
   }
   o->c = sc;
   mrb_field_write_barrier(mrb, (struct RBasic*)o, (struct RBasic*)sc);
-  mrb_field_write_barrier(mrb, (struct RBasic*)sc, (struct RBasic*)o);
   mrb_obj_iv_set(mrb, (struct RObject*)sc, MRB_SYM(__attached__), mrb_obj_value(o));
   sc->flags |= o->flags & MRB_FL_OBJ_IS_FROZEN;
 }