rollup merge of #20560: aturon/stab-2-iter-ops-slice

Conflicts:
	src/libcollections/slice.rs
	src/libcore/iter.rs
	src/libstd/sync/mpsc/mod.rs
	src/libstd/sync/rwlock.rs

src/libstd/sync/condvar.rs

@@ -188,6 +188,7 @@ impl Condvar {
     pub fn notify_all(&self) { unsafe { self.inner.inner.notify_all() } }
 }
 
+#[stable]
 impl Drop for Condvar {
     fn drop(&mut self) {
         unsafe { self.inner.inner.destroy() }

src/libstd/sync/mpsc/mod.rs

@@ -675,6 +675,7 @@ impl<T: Send> Clone for Sender<T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for Sender<T> {
     fn drop(&mut self) {
         match *unsafe { self.inner_mut() } {
@@ -768,6 +769,7 @@ impl<T: Send> Clone for SyncSender<T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for SyncSender<T> {
     fn drop(&mut self) {
         unsafe { (*self.inner.get()).drop_chan(); }
@@ -1006,12 +1008,15 @@ impl<T: Send> select::Packet for Receiver<T> {
     }
 }
 
-#[unstable]
-impl<'a, T: Send> Iterator<T> for Messages<'a, T> {
-    fn next(&mut self) -> Option<T> { self.rx.recv_opt().ok() }
+#[stable]
+impl<'a, T: Send> Iterator for Iter<'a, T> {
+    type Item = T;
+
+    fn next(&mut self) -> Option<T> { self.rx.recv().ok() }
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for Receiver<T> {
     fn drop(&mut self) {
         match *unsafe { self.inner_mut() } {

src/libstd/sync/mpsc/mpsc_queue.rs

@@ -138,6 +138,7 @@ impl<T: Send> Queue<T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for Queue<T> {
     fn drop(&mut self) {
         unsafe {

src/libstd/sync/mutex.rs

@@ -228,6 +228,7 @@ impl<T: Send> Mutex<T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for Mutex<T> {
     fn drop(&mut self) {
         // This is actually safe b/c we know that there is no further usage of
@@ -291,6 +292,7 @@ impl<'mutex, T> MutexGuard<'mutex, T> {
     }
 }
 
+#[stable]
 impl<'mutex, T> Deref for MutexGuard<'mutex, T> {
     type Target = T;
 
@@ -298,6 +300,7 @@ impl<'mutex, T> Deref for MutexGuard<'mutex, T> {
         unsafe { &*self.__data.get() }
     }
 }
+#[stable]
 impl<'mutex, T> DerefMut for MutexGuard<'mutex, T> {
     fn deref_mut<'a>(&'a mut self) -> &'a mut T {
         unsafe { &mut *self.__data.get() }
@@ -305,6 +308,7 @@ impl<'mutex, T> DerefMut for MutexGuard<'mutex, T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<'a, T> Drop for MutexGuard<'a, T> {
     #[inline]
     fn drop(&mut self) {

src/libstd/sync/rwlock.rs

@@ -228,6 +228,7 @@ impl<T: Send + Sync> RwLock<T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T> Drop for RwLock<T> {
     fn drop(&mut self) {
         unsafe { self.inner.lock.destroy() }
@@ -327,16 +328,19 @@ impl<'rwlock, T> RwLockWriteGuard<'rwlock, T> {
     }
 }
 
+#[stable]
 impl<'rwlock, T> Deref for RwLockReadGuard<'rwlock, T> {
     type Target = T;
 
     fn deref(&self) -> &T { unsafe { &*self.__data.get() } }
 }
+#[stable]
 impl<'rwlock, T> Deref for RwLockWriteGuard<'rwlock, T> {
     type Target = T;
 
     fn deref(&self) -> &T { unsafe { &*self.__data.get() } }
 }
+#[stable]
 impl<'rwlock, T> DerefMut for RwLockWriteGuard<'rwlock, T> {
     fn deref_mut(&mut self) -> &mut T {
         unsafe { &mut *self.__data.get() }
@@ -344,6 +348,7 @@ impl<'rwlock, T> DerefMut for RwLockWriteGuard<'rwlock, T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<'a, T> Drop for RwLockReadGuard<'a, T> {
     fn drop(&mut self) {
         unsafe { self.__lock.lock.read_unlock(); }
@@ -351,6 +356,7 @@ impl<'a, T> Drop for RwLockReadGuard<'a, T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<'a, T> Drop for RwLockWriteGuard<'a, T> {
     fn drop(&mut self) {
         self.__lock.poison.done(&self.__poison);

src/libstd/sync/semaphore.rs

@@ -99,6 +99,7 @@ impl Semaphore {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<'a> Drop for SemaphoreGuard<'a> {
     fn drop(&mut self) {
         self.sem.release();