From 18787914aa24bac7237e7abd96dfffed4fa73b61 Mon Sep 17 00:00:00 2001
From: Scott McMurray <scottmcm@users.noreply.github.com>
Date: Sun, 1 Oct 2023 18:56:38 -0700
Subject: [PATCH] Add `ptr::addr_eq`

---
 library/core/src/ptr/mod.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs
index d1286a1dea7..fe3d46d77f0 100644
--- a/library/core/src/ptr/mod.rs
+++ b/library/core/src/ptr/mod.rs
@@ -1868,6 +1868,28 @@ pub fn eq<T: ?Sized>(a: *const T, b: *const T) -> bool {
     a == b
 }
 
+/// Compares the *addresses* of the two pointers for equality,
+/// ignoring any metadata in fat pointers.
+///
+/// If the arguments are thin pointers of the same type,
+/// then this is the same as [`eq`].
+///
+/// # Examples
+///
+/// ```
+/// #![feature(ptr_addr_eq)]
+///
+/// let whole: &[i32; 3] = &[1, 2, 3];
+/// let first: &i32 = &whole[0];
+/// assert!(std::ptr::addr_eq(whole, first));
+/// assert!(!std::ptr::eq::<dyn std::fmt::Debug>(whole, first));
+/// ```
+#[unstable(feature = "ptr_addr_eq", issue = "116324")]
+#[inline(always)]
+pub fn addr_eq<T: ?Sized, U: ?Sized>(p: *const T, q: *const U) -> bool {
+    (p as *const ()) == (q as *const ())
+}
+
 /// Hash a raw pointer.
 ///
 /// This can be used to hash a `&T` reference (which coerces to `*const T` implicitly)