From fa910e2bba324f715afad0ca71330fb3b54cfaeb Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Sun, 18 Jan 2026 21:09:21 -0500
Subject: [ruby/mmtk] Restore MMTK_DEBUG around zeroing in obj_free

https://github.com/ruby/mmtk/commit/ae69d69768
---
 gc/mmtk/mmtk.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gc/mmtk/mmtk.c b/gc/mmtk/mmtk.c
index b1a836a8c5..b9fccd6b4c 100644
--- a/gc/mmtk/mmtk.c
+++ b/gc/mmtk/mmtk.c
@@ -333,10 +333,9 @@ rb_mmtk_call_obj_free(MMTk_ObjectReference object)
 
     rb_gc_obj_free(objspace, obj);
 
-    // TODO: uncomment this when done debugging
-// #ifdef MMTK_DEBUG
+#ifdef MMTK_DEBUG
     memset((void *)obj, 0, rb_gc_impl_obj_slot_size(obj));
-// #endif
+#endif
 }
 
 static size_t
-- 
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