From c40d6530b95732913ee6c65185784f2ebe56d242 Mon Sep 17 00:00:00 2001
From: Jake Hughes <jh@jakehughes.uk>
Date: Thu, 31 Oct 2024 20:06:17 +0000
Subject: [PATCH] Enable finalizer elision for HashMap backing

---
 src/lib.rs     | 3 +++
 src/raw/mod.rs | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index f03ddb6ad..796c55433 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,6 +9,7 @@
 //! [here]: https://github.com/abseil/abseil-cpp/blob/master/absl/container/internal/raw_hash_set.h
 //! [CppCon talk]: https://www.youtube.com/watch?v=ncHmEUmJZf4
 
+#![feature(gc)]
 #![no_std]
 #![cfg_attr(
     feature = "nightly",
@@ -44,8 +45,10 @@
 extern crate std;
 
 #[cfg_attr(test, macro_use)]
+#[allow(unused_extern_crates)]
 extern crate alloc;
 
+
 #[cfg(feature = "nightly")]
 #[cfg(doctest)]
 doc_comment::doctest!("../README.md");
diff --git a/src/raw/mod.rs b/src/raw/mod.rs
index c8e8e2912..94e78edc9 100644
--- a/src/raw/mod.rs
+++ b/src/raw/mod.rs
@@ -1,6 +1,7 @@
 use crate::alloc::alloc::{handle_alloc_error, Layout};
 use crate::scopeguard::{guard, ScopeGuard};
 use crate::TryReserveError;
+use core::gc::DropMethodFinalizerElidable;
 use core::iter::FusedIterator;
 use core::marker::PhantomData;
 use core::mem;
@@ -3658,6 +3659,8 @@ impl<T, A: Allocator + Default> Default for RawTable<T, A> {
     }
 }
 
+unsafe impl<T, A: Allocator > DropMethodFinalizerElidable for RawTable<T, A> {}
+
 #[cfg(feature = "nightly")]
 unsafe impl<#[may_dangle] T, A: Allocator> Drop for RawTable<T, A> {
     #[cfg_attr(feature = "inline-more", inline)]