From 1a4b4cd7f8b53fc52191c1ddcf3f624a5e687c24 Mon Sep 17 00:00:00 2001
From: Jean Boussier <byroot@ruby-lang.org>
Date: Wed, 15 Feb 2023 15:18:01 +0100
Subject: Move `attached_object` into `rb_classext_struct`

Given that signleton classes don't have an allocator,
we can re-use these bytes to store the attached object
in `rb_classext_struct` without making it larger.
---
 vm_method.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'vm_method.c')

diff --git a/vm_method.c b/vm_method.c
index 9af240a2cc..98af316fe6 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -1151,7 +1151,10 @@ void
 rb_define_alloc_func(VALUE klass, VALUE (*func)(VALUE))
 {
     Check_Type(klass, T_CLASS);
-    RCLASS_ALLOCATOR(klass) = func;
+    if (FL_TEST_RAW(klass, FL_SINGLETON)) {
+        rb_raise(rb_eTypeError, "can't define an allocator for a singleton class");
+    }
+    RCLASS_SET_ALLOCATOR(klass, func);
 }
 
 void
-- 
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