https://git.ruby-lang.org/ruby.git/commit/?id=4c93c124c2

From 4c93c124c29465e49343b47c935be99ad67a7d83 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 20 Aug 2021 13:46:19 +0900
Subject: Turned the reminder comment to a compile-time message

---
 gc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gc.c b/gc.c
index c70f8a3..fa4ab44 100644
--- a/gc.c
+++ b/gc.c
@@ -2754,7 +2754,8 @@ rb_data_object_check(VALUE klass) https://github.com/ruby/ruby/blob/trunk/gc.c#L2754
 {
     if (klass != rb_cObject && (rb_get_alloc_func(klass) == rb_class_allocate_instance)) {
         rb_undef_alloc_func(klass);
-#if 0 /* TODO: enable at the next release */
+#if RUBY_VERSION_SINCE(3, 2)
+        RBIMPL_TODO("enable the warning at this release");
         rb_warn("undefining the allocator of T_DATA class %"PRIsVALUE, klass);
 #endif
     }
-- 
cgit v1.1


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