From 9e4a75696303812d23366d57e4381166b1f88bb1 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Tue, 14 Oct 2025 23:59:39 -0700
Subject: [PATCH] Use BUILTIN_TYPE in gc_mark_check_t_none

---
 gc/default/default.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gc/default/default.c b/gc/default/default.c
index af386a9793..7c10cc3306 100644
--- a/gc/default/default.c
+++ b/gc/default/default.c
@@ -4377,7 +4377,7 @@ gc_grey(rb_objspace_t *objspace, VALUE obj)
 static inline void
 gc_mark_check_t_none(rb_objspace_t *objspace, VALUE obj)
 {
-    if (RB_UNLIKELY(RB_TYPE_P(obj, T_NONE))) {
+    if (RB_UNLIKELY(BUILTIN_TYPE(obj) == T_NONE)) {
         enum {info_size = 256};
         char obj_info_buf[info_size];
         rb_raw_obj_info(obj_info_buf, info_size, obj);