From 0f1cb9234574d3d39c85b5b98a306306e20f068b Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Thu, 20 Feb 2025 13:58:27 -0500
Subject: [PATCH] [ruby/mmtk] Fix compatibility for Rust 1.85

https://github.com/ruby/mmtk/commit/9da566e26a
---
 gc/mmtk/src/abi.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gc/mmtk/src/abi.rs b/gc/mmtk/src/abi.rs
index 5b56d199b2..fc9c899743 100644
--- a/gc/mmtk/src/abi.rs
+++ b/gc/mmtk/src/abi.rs
@@ -163,7 +163,7 @@ impl ObjectClosure {
         F2: 'env + FnOnce() -> T,
     {
         debug_assert!(
-            self.c_function == THE_UNREGISTERED_CLOSURE_FUNC,
+            std::ptr::fn_addr_eq(self.c_function, THE_UNREGISTERED_CLOSURE_FUNC),
             "set_temporarily_and_run_code is recursively called."
         );
         self.c_function = Self::c_function_registered::<F1>;