Use as_mut_ptr instead of casts

src/libstd/lib.rs

@@ -234,6 +234,7 @@
 #![feature(allocator_internals)]
 #![feature(allow_internal_unsafe)]
 #![feature(allow_internal_unstable)]
+#![feature(atomic_mut_ptr)]
 #![feature(arbitrary_self_types)]
 #![feature(array_error_internals)]
 #![feature(asm)]

src/libstd/sys/wasm/alloc.rs

@@ -67,7 +67,7 @@ mod lock {
             //
             //     unsafe {
             //         let r = core::arch::wasm32::i32_atomic_wait(
-            //             &LOCKED as *const AtomicI32 as *mut i32,
+            //             LOCKED.as_mut_ptr(),
             //             1,  //     expected value
             //             -1, //     timeout
             //         );
@@ -143,7 +143,7 @@ mod lock {
             //
             //     unsafe {
             //         core::arch::wasm32::atomic_notify(
-            //             &LOCKED as *const AtomicI32 as *mut i32,
+            //             LOCKED.as_mut_ptr(),
             //             1, //     only one thread
             //         );
             //     }

src/libstd/sys/wasm/condvar_atomics.rs

@@ -89,6 +89,6 @@ impl Condvar {
     #[inline]
     fn ptr(&self) -> *mut i32 {
         assert_eq!(mem::size_of::<usize>(), mem::size_of::<i32>());
-        &self.cnt as *const AtomicUsize as *mut i32
+        self.cnt.as_mut_ptr() as *mut i32
     }
 }

src/libstd/sys/wasm/mutex_atomics.rs

@@ -56,7 +56,7 @@ impl Mutex {
     #[inline]
     fn ptr(&self) -> *mut i32 {
         assert_eq!(mem::size_of::<usize>(), mem::size_of::<i32>());
-        &self.locked as *const AtomicUsize as *mut isize as *mut i32
+        self.locked.as_mut_ptr() as *mut i32
     }
 }
 
@@ -145,6 +145,6 @@ impl ReentrantMutex {
 
     #[inline]
     fn ptr(&self) -> *mut i32 {
-        &self.owner as *const AtomicU32 as *mut i32
+        self.owner.as_mut_ptr() as *mut i32
     }
 }