From 1735e41d1cbbe0666e188ccf3a064e5c8afb482c Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Thu, 12 Feb 2015 10:47:02 -0500
Subject: [PATCH] Fallout: AtomicPtr needs phantom data to indicate that it
 contains an unsafe pointer.

---
 src/libcore/atomic.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/libcore/atomic.rs b/src/libcore/atomic.rs
index 05d864accc1..6afe5b2257d 100644
--- a/src/libcore/atomic.rs
+++ b/src/libcore/atomic.rs
@@ -76,6 +76,7 @@ use marker::Sync;
 
 use intrinsics;
 use cell::UnsafeCell;
+use marker::PhantomData;
 
 /// A boolean type which can be safely shared between threads.
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -105,6 +106,7 @@ unsafe impl Sync for AtomicUsize {}
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct AtomicPtr<T> {
     p: UnsafeCell<usize>,
+    _marker: PhantomData<*mut T>,
 }
 
 unsafe impl<T> Sync for AtomicPtr<T> {}
@@ -791,7 +793,8 @@ impl<T> AtomicPtr<T> {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new(p: *mut T) -> AtomicPtr<T> {
-        AtomicPtr { p: UnsafeCell::new(p as usize) }
+        AtomicPtr { p: UnsafeCell::new(p as usize),
+                    _marker: PhantomData }
     }
 
     /// Loads a value from the pointer.