auto merge of #20610 : alexcrichton/rust/rollup, r=alexcrichton

9 files changed, 106 insertions, 91 deletions

diff --git a/src/libstd/sync/condvar.rs b/src/libstd/sync/condvar.rs
index 7734f655ed2..e97be51fdbc 100644
--- a/src/libstd/sync/condvar.rs
+++ b/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() }
diff --git a/src/libstd/sync/mod.rs b/src/libstd/sync/mod.rs
index 6ce278726e9..6fff6765bd3 100644
--- a/src/libstd/sync/mod.rs
+++ b/src/libstd/sync/mod.rs
@@ -15,15 +15,15 @@
 //! and/or blocking at all, but rather provide the necessary tools to build
 //! other types of concurrent primitives.
 
-#![experimental]
+#![stable]
 
 pub use alloc::arc::{Arc, Weak};
 pub use core::atomic;
 
 pub use self::mutex::{Mutex, MutexGuard, StaticMutex};
 pub use self::mutex::MUTEX_INIT;
-pub use self::rwlock::{RWLock, StaticRWLock, RWLOCK_INIT};
-pub use self::rwlock::{RWLockReadGuard, RWLockWriteGuard};
+pub use self::rwlock::{RwLock, StaticRwLock, RW_LOCK_INIT};
+pub use self::rwlock::{RwLockReadGuard, RwLockWriteGuard};
 pub use self::condvar::{Condvar, StaticCondvar, CONDVAR_INIT};
 pub use self::once::{Once, ONCE_INIT};
 pub use self::semaphore::{Semaphore, SemaphoreGuard};
diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index 6bc3f561bb3..7c18b8a43fa 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -163,6 +163,8 @@
 //! }
 //! ```
 
+#![stable]
+
 // A description of how Rust's channel implementation works
 //
 // Channels are supposed to be the basic building block for all other
@@ -565,6 +567,7 @@ impl<T: Send> Sender<T> {
     /// drop(rx);
     /// assert_eq!(tx.send(1i).err().unwrap().0, 1);
     /// ```
+    #[stable]
     pub fn send(&self, t: T) -> Result<(), SendError<T>> {
         let (new_inner, ret) = match *unsafe { self.inner() } {
             Flavor::Oneshot(ref p) => {
@@ -587,7 +590,7 @@ impl<T: Send> Sender<T> {
                                 // asleep (we're looking at it), so the receiver
                                 // can't go away.
                                 (*a.get()).send(t).ok().unwrap();
-                                token.signal();
+                        token.signal();
                                 (a, Ok(()))
                             }
                         }
@@ -657,6 +660,7 @@ 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() } {
@@ -720,6 +724,7 @@ 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(); }
@@ -935,7 +940,7 @@ impl<T: Send> select::Packet for Receiver<T> {
     }
 }
 
-#[unstable]
+#[stable]
 impl<'a, T: Send> Iterator for Iter<'a, T> {
     type Item = T;
 
@@ -943,6 +948,7 @@ impl<'a, T: Send> Iterator for Iter<'a, T> {
 }
 
 #[unsafe_destructor]
+#[stable]
 impl<T: Send> Drop for Receiver<T> {
     fn drop(&mut self) {
         match *unsafe { self.inner_mut() } {
diff --git a/src/libstd/sync/mpsc/mpsc_queue.rs b/src/libstd/sync/mpsc/mpsc_queue.rs
index 8f85dc6e043..9ad24a5a11e 100644
--- a/src/libstd/sync/mpsc/mpsc_queue.rs
+++ b/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 {
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index b158bd69c7b..6b3dd89f33b 100644
--- a/src/libstd/sync/mutex.rs
+++ b/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) {
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index 08e323c9cb4..aa2d957a3eb 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -121,10 +121,6 @@ impl Once {
             unsafe { self.mutex.destroy() }
         }
     }
-
-    /// Deprecated
-    #[deprecated = "renamed to `call_once`"]
-    pub fn doit<F>(&'static self, f: F) where F: FnOnce() { self.call_once(f) }
 }
 
 #[cfg(test)]
diff --git a/src/libstd/sync/poison.rs b/src/libstd/sync/poison.rs
index 6e4df118209..385df45b400 100644
--- a/src/libstd/sync/poison.rs
+++ b/src/libstd/sync/poison.rs
@@ -49,7 +49,7 @@ pub struct Guard {
 
 /// A type of error which can be returned whenever a lock is acquired.
 ///
-/// Both Mutexes and RWLocks are poisoned whenever a task fails while the lock
+/// Both Mutexes and RwLocks are poisoned whenever a task fails while the lock
 /// is held. The precise semantics for when a lock is poisoned is documented on
 /// each lock, but once a lock is poisoned then all future acquisitions will
 /// return this error.
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index b2367ff8352..4afd5bb63f4 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -31,17 +31,17 @@ use sys_common::rwlock as sys;
 ///
 /// # Poisoning
 ///
-/// RWLocks, like Mutexes, will become poisoned on panics. Note, however, that
-/// an RWLock may only be poisoned if a panic occurs while it is locked
+/// RwLocks, like Mutexes, will become poisoned on panics. Note, however, that
+/// an RwLock may only be poisoned if a panic occurs while it is locked
 /// exclusively (write mode). If a panic occurs in any reader, then the lock
 /// will not be poisoned.
 ///
 /// # Examples
 ///
 /// ```
-/// use std::sync::RWLock;
+/// use std::sync::RwLock;
 ///
-/// let lock = RWLock::new(5i);
+/// let lock = RwLock::new(5i);
 ///
 /// // many reader locks can be held at once
 /// {
@@ -59,26 +59,26 @@ use sys_common::rwlock as sys;
 /// } // write lock is dropped here
 /// ```
 #[stable]
-pub struct RWLock<T> {
-    inner: Box<StaticRWLock>,
+pub struct RwLock<T> {
+    inner: Box<StaticRwLock>,
     data: UnsafeCell<T>,
 }
 
-unsafe impl<T:'static+Send> Send for RWLock<T> {}
-unsafe impl<T> Sync for RWLock<T> {}
+unsafe impl<T:'static+Send> Send for RwLock<T> {}
+unsafe impl<T> Sync for RwLock<T> {}
 
-/// Structure representing a statically allocated RWLock.
+/// Structure representing a statically allocated RwLock.
 ///
 /// This structure is intended to be used inside of a `static` and will provide
 /// automatic global access as well as lazy initialization. The internal
-/// resources of this RWLock, however, must be manually deallocated.
+/// resources of this RwLock, however, must be manually deallocated.
 ///
 /// # Example
 ///
 /// ```
-/// use std::sync::{StaticRWLock, RWLOCK_INIT};
+/// use std::sync::{StaticRwLock, RW_LOCK_INIT};
 ///
-/// static LOCK: StaticRWLock = RWLOCK_INIT;
+/// static LOCK: StaticRwLock = RW_LOCK_INIT;
 ///
 /// {
 ///     let _g = LOCK.read().unwrap();
@@ -90,18 +90,18 @@ unsafe impl<T> Sync for RWLock<T> {}
 /// }
 /// unsafe { LOCK.destroy() } // free all resources
 /// ```
-#[unstable = "may be merged with RWLock in the future"]
-pub struct StaticRWLock {
+#[unstable = "may be merged with RwLock in the future"]
+pub struct StaticRwLock {
     lock: sys::RWLock,
     poison: poison::Flag,
 }
 
-unsafe impl Send for StaticRWLock {}
-unsafe impl Sync for StaticRWLock {}
+unsafe impl Send for StaticRwLock {}
+unsafe impl Sync for StaticRwLock {}
 
 /// Constant initialization for a statically-initialized rwlock.
-#[unstable = "may be merged with RWLock in the future"]
-pub const RWLOCK_INIT: StaticRWLock = StaticRWLock {
+#[unstable = "may be merged with RwLock in the future"]
+pub const RW_LOCK_INIT: StaticRwLock = StaticRwLock {
     lock: sys::RWLOCK_INIT,
     poison: poison::FLAG_INIT,
 };
@@ -110,8 +110,8 @@ pub const RWLOCK_INIT: StaticRWLock = StaticRWLock {
 /// dropped.
 #[must_use]
 #[stable]
-pub struct RWLockReadGuard<'a, T: 'a> {
-    __lock: &'a StaticRWLock,
+pub struct RwLockReadGuard<'a, T: 'a> {
+    __lock: &'a StaticRwLock,
     __data: &'a UnsafeCell<T>,
     __marker: marker::NoSend,
 }
@@ -120,18 +120,18 @@ pub struct RWLockReadGuard<'a, T: 'a> {
 /// dropped.
 #[must_use]
 #[stable]
-pub struct RWLockWriteGuard<'a, T: 'a> {
-    __lock: &'a StaticRWLock,
+pub struct RwLockWriteGuard<'a, T: 'a> {
+    __lock: &'a StaticRwLock,
     __data: &'a UnsafeCell<T>,
     __poison: poison::Guard,
     __marker: marker::NoSend,
 }
 
-impl<T: Send + Sync> RWLock<T> {
-    /// Creates a new instance of an RWLock which is unlocked and read to go.
+impl<T: Send + Sync> RwLock<T> {
+    /// Creates a new instance of an RwLock which is unlocked and read to go.
     #[stable]
-    pub fn new(t: T) -> RWLock<T> {
-        RWLock { inner: box RWLOCK_INIT, data: UnsafeCell::new(t) }
+    pub fn new(t: T) -> RwLock<T> {
+        RwLock { inner: box RW_LOCK_INIT, data: UnsafeCell::new(t) }
     }
 
     /// Locks this rwlock with shared read access, blocking the current thread
@@ -148,14 +148,14 @@ impl<T: Send + Sync> RWLock<T> {
     ///
     /// # Failure
     ///
-    /// This function will return an error if the RWLock is poisoned. An RWLock
+    /// This function will return an error if the RwLock is poisoned. An RwLock
     /// is poisoned whenever a writer panics while holding an exclusive lock.
     /// The failure will occur immediately after the lock has been acquired.
     #[inline]
     #[stable]
-    pub fn read(&self) -> LockResult<RWLockReadGuard<T>> {
+    pub fn read(&self) -> LockResult<RwLockReadGuard<T>> {
         unsafe { self.inner.lock.read() }
-        RWLockReadGuard::new(&*self.inner, &self.data)
+        RwLockReadGuard::new(&*self.inner, &self.data)
     }
 
     /// Attempt to acquire this lock with shared read access.
@@ -169,15 +169,15 @@ impl<T: Send + Sync> RWLock<T> {
     ///
     /// # Failure
     ///
-    /// This function will return an error if the RWLock is poisoned. An RWLock
+    /// This function will return an error if the RwLock is poisoned. An RwLock
     /// is poisoned whenever a writer panics while holding an exclusive lock. An
     /// error will only be returned if the lock would have otherwise been
     /// acquired.
     #[inline]
     #[stable]
-    pub fn try_read(&self) -> TryLockResult<RWLockReadGuard<T>> {
+    pub fn try_read(&self) -> TryLockResult<RwLockReadGuard<T>> {
         if unsafe { self.inner.lock.try_read() } {
-            Ok(try!(RWLockReadGuard::new(&*self.inner, &self.data)))
+            Ok(try!(RwLockReadGuard::new(&*self.inner, &self.data)))
         } else {
             Err(TryLockError::WouldBlock)
         }
@@ -194,14 +194,14 @@ impl<T: Send + Sync> RWLock<T> {
     ///
     /// # Failure
     ///
-    /// This function will return an error if the RWLock is poisoned. An RWLock
+    /// This function will return an error if the RwLock is poisoned. An RwLock
     /// is poisoned whenever a writer panics while holding an exclusive lock.
     /// An error will be returned when the lock is acquired.
     #[inline]
     #[stable]
-    pub fn write(&self) -> LockResult<RWLockWriteGuard<T>> {
+    pub fn write(&self) -> LockResult<RwLockWriteGuard<T>> {
         unsafe { self.inner.lock.write() }
-        RWLockWriteGuard::new(&*self.inner, &self.data)
+        RwLockWriteGuard::new(&*self.inner, &self.data)
     }
 
     /// Attempt to lock this rwlock with exclusive write access.
@@ -212,15 +212,15 @@ impl<T: Send + Sync> RWLock<T> {
     ///
     /// # Failure
     ///
-    /// This function will return an error if the RWLock is poisoned. An RWLock
+    /// This function will return an error if the RwLock is poisoned. An RwLock
     /// is poisoned whenever a writer panics while holding an exclusive lock. An
     /// error will only be returned if the lock would have otherwise been
     /// acquired.
     #[inline]
     #[stable]
-    pub fn try_write(&self) -> TryLockResult<RWLockWriteGuard<T>> {
+    pub fn try_write(&self) -> TryLockResult<RwLockWriteGuard<T>> {
         if unsafe { self.inner.lock.try_read() } {
-            Ok(try!(RWLockWriteGuard::new(&*self.inner, &self.data)))
+            Ok(try!(RwLockWriteGuard::new(&*self.inner, &self.data)))
         } else {
             Err(TryLockError::WouldBlock)
         }
@@ -228,7 +228,8 @@ impl<T: Send + Sync> RWLock<T> {
 }
 
 #[unsafe_destructor]
-impl<T> Drop for RWLock<T> {
+#[stable]
+impl<T> Drop for RwLock<T> {
     fn drop(&mut self) {
         unsafe { self.inner.lock.destroy() }
     }
@@ -238,27 +239,27 @@ struct Dummy(UnsafeCell<()>);
 unsafe impl Sync for Dummy {}
 static DUMMY: Dummy = Dummy(UnsafeCell { value: () });
 
-impl StaticRWLock {
+impl StaticRwLock {
     /// Locks this rwlock with shared read access, blocking the current thread
     /// until it can be acquired.
     ///
-    /// See `RWLock::read`.
+    /// See `RwLock::read`.
     #[inline]
-    #[unstable = "may be merged with RWLock in the future"]
-    pub fn read(&'static self) -> LockResult<RWLockReadGuard<'static, ()>> {
+    #[unstable = "may be merged with RwLock in the future"]
+    pub fn read(&'static self) -> LockResult<RwLockReadGuard<'static, ()>> {
         unsafe { self.lock.read() }
-        RWLockReadGuard::new(self, &DUMMY.0)
+        RwLockReadGuard::new(self, &DUMMY.0)
     }
 
     /// Attempt to acquire this lock with shared read access.
     ///
-    /// See `RWLock::try_read`.
+    /// See `RwLock::try_read`.
     #[inline]
-    #[unstable = "may be merged with RWLock in the future"]
+    #[unstable = "may be merged with RwLock in the future"]
     pub fn try_read(&'static self)
-                    -> TryLockResult<RWLockReadGuard<'static, ()>> {
+                    -> TryLockResult<RwLockReadGuard<'static, ()>> {
         if unsafe { self.lock.try_read() } {
-            Ok(try!(RWLockReadGuard::new(self, &DUMMY.0)))
+            Ok(try!(RwLockReadGuard::new(self, &DUMMY.0)))
         } else {
             Err(TryLockError::WouldBlock)
         }
@@ -267,23 +268,23 @@ impl StaticRWLock {
     /// Lock this rwlock with exclusive write access, blocking the current
     /// thread until it can be acquired.
     ///
-    /// See `RWLock::write`.
+    /// See `RwLock::write`.
     #[inline]
-    #[unstable = "may be merged with RWLock in the future"]
-    pub fn write(&'static self) -> LockResult<RWLockWriteGuard<'static, ()>> {
+    #[unstable = "may be merged with RwLock in the future"]
+    pub fn write(&'static self) -> LockResult<RwLockWriteGuard<'static, ()>> {
         unsafe { self.lock.write() }
-        RWLockWriteGuard::new(self, &DUMMY.0)
+        RwLockWriteGuard::new(self, &DUMMY.0)
     }
 
     /// Attempt to lock this rwlock with exclusive write access.
     ///
-    /// See `RWLock::try_write`.
+    /// See `RwLock::try_write`.
     #[inline]
-    #[unstable = "may be merged with RWLock in the future"]
+    #[unstable = "may be merged with RwLock in the future"]
     pub fn try_write(&'static self)
-                     -> TryLockResult<RWLockWriteGuard<'static, ()>> {
+                     -> TryLockResult<RwLockWriteGuard<'static, ()>> {
         if unsafe { self.lock.try_write() } {
-            Ok(try!(RWLockWriteGuard::new(self, &DUMMY.0)))
+            Ok(try!(RwLockWriteGuard::new(self, &DUMMY.0)))
         } else {
             Err(TryLockError::WouldBlock)
         }
@@ -295,17 +296,17 @@ impl StaticRWLock {
     /// active users of the lock, and this also doesn't prevent any future users
     /// of this lock. This method is required to be called to not leak memory on
     /// all platforms.
-    #[unstable = "may be merged with RWLock in the future"]
+    #[unstable = "may be merged with RwLock in the future"]
     pub unsafe fn destroy(&'static self) {
         self.lock.destroy()
     }
 }
 
-impl<'rwlock, T> RWLockReadGuard<'rwlock, T> {
-    fn new(lock: &'rwlock StaticRWLock, data: &'rwlock UnsafeCell<T>)
-           -> LockResult<RWLockReadGuard<'rwlock, T>> {
+impl<'rwlock, T> RwLockReadGuard<'rwlock, T> {
+    fn new(lock: &'rwlock StaticRwLock, data: &'rwlock UnsafeCell<T>)
+           -> LockResult<RwLockReadGuard<'rwlock, T>> {
         poison::map_result(lock.poison.borrow(), |_| {
-            RWLockReadGuard {
+            RwLockReadGuard {
                 __lock: lock,
                 __data: data,
                 __marker: marker::NoSend,
@@ -313,11 +314,11 @@ impl<'rwlock, T> RWLockReadGuard<'rwlock, T> {
         })
     }
 }
-impl<'rwlock, T> RWLockWriteGuard<'rwlock, T> {
-    fn new(lock: &'rwlock StaticRWLock, data: &'rwlock UnsafeCell<T>)
-           -> LockResult<RWLockWriteGuard<'rwlock, T>> {
+impl<'rwlock, T> RwLockWriteGuard<'rwlock, T> {
+    fn new(lock: &'rwlock StaticRwLock, data: &'rwlock UnsafeCell<T>)
+           -> LockResult<RwLockWriteGuard<'rwlock, T>> {
         poison::map_result(lock.poison.borrow(), |guard| {
-            RWLockWriteGuard {
+            RwLockWriteGuard {
                 __lock: lock,
                 __data: data,
                 __poison: guard,
@@ -327,31 +328,36 @@ impl<'rwlock, T> RWLockWriteGuard<'rwlock, T> {
     }
 }
 
-impl<'rwlock, T> Deref for RWLockReadGuard<'rwlock, T> {
+#[stable]
+impl<'rwlock, T> Deref for RwLockReadGuard<'rwlock, T> {
     type Target = T;
 
     fn deref(&self) -> &T { unsafe { &*self.__data.get() } }
 }
-impl<'rwlock, T> Deref for RWLockWriteGuard<'rwlock, T> {
+#[stable]
+impl<'rwlock, T> Deref for RwLockWriteGuard<'rwlock, T> {
     type Target = T;
 
     fn deref(&self) -> &T { unsafe { &*self.__data.get() } }
 }
-impl<'rwlock, T> DerefMut for RWLockWriteGuard<'rwlock, T> {
+#[stable]
+impl<'rwlock, T> DerefMut for RwLockWriteGuard<'rwlock, T> {
     fn deref_mut(&mut self) -> &mut T {
         unsafe { &mut *self.__data.get() }
     }
 }
 
 #[unsafe_destructor]
-impl<'a, T> Drop for RWLockReadGuard<'a, T> {
+#[stable]
+impl<'a, T> Drop for RwLockReadGuard<'a, T> {
     fn drop(&mut self) {
         unsafe { self.__lock.lock.read_unlock(); }
     }
 }
 
 #[unsafe_destructor]
-impl<'a, T> Drop for RWLockWriteGuard<'a, T> {
+#[stable]
+impl<'a, T> Drop for RwLockWriteGuard<'a, T> {
     fn drop(&mut self) {
         self.__lock.poison.done(&self.__poison);
         unsafe { self.__lock.lock.write_unlock(); }
@@ -365,11 +371,11 @@ mod tests {
     use rand::{self, Rng};
     use sync::mpsc::channel;
     use thread::Thread;
-    use sync::{Arc, RWLock, StaticRWLock, RWLOCK_INIT};
+    use sync::{Arc, RwLock, StaticRwLock, RW_LOCK_INIT};
 
     #[test]
     fn smoke() {
-        let l = RWLock::new(());
+        let l = RwLock::new(());
         drop(l.read().unwrap());
         drop(l.write().unwrap());
         drop((l.read().unwrap(), l.read().unwrap()));
@@ -378,7 +384,7 @@ mod tests {
 
     #[test]
     fn static_smoke() {
-        static R: StaticRWLock = RWLOCK_INIT;
+        static R: StaticRwLock = RW_LOCK_INIT;
         drop(R.read().unwrap());
         drop(R.write().unwrap());
         drop((R.read().unwrap(), R.read().unwrap()));
@@ -388,7 +394,7 @@ mod tests {
 
     #[test]
     fn frob() {
-        static R: StaticRWLock = RWLOCK_INIT;
+        static R: StaticRwLock = RW_LOCK_INIT;
         static N: uint = 10;
         static M: uint = 1000;
 
@@ -414,7 +420,7 @@ mod tests {
 
     #[test]
     fn test_rw_arc_poison_wr() {
-        let arc = Arc::new(RWLock::new(1i));
+        let arc = Arc::new(RwLock::new(1i));
         let arc2 = arc.clone();
         let _: Result<uint, _> = Thread::spawn(move|| {
             let _lock = arc2.write().unwrap();
@@ -425,7 +431,7 @@ mod tests {
 
     #[test]
     fn test_rw_arc_poison_ww() {
-        let arc = Arc::new(RWLock::new(1i));
+        let arc = Arc::new(RwLock::new(1i));
         let arc2 = arc.clone();
         let _: Result<uint, _> = Thread::spawn(move|| {
             let _lock = arc2.write().unwrap();
@@ -436,7 +442,7 @@ mod tests {
 
     #[test]
     fn test_rw_arc_no_poison_rr() {
-        let arc = Arc::new(RWLock::new(1i));
+        let arc = Arc::new(RwLock::new(1i));
         let arc2 = arc.clone();
         let _: Result<uint, _> = Thread::spawn(move|| {
             let _lock = arc2.read().unwrap();
@@ -447,7 +453,7 @@ mod tests {
     }
     #[test]
     fn test_rw_arc_no_poison_rw() {
-        let arc = Arc::new(RWLock::new(1i));
+        let arc = Arc::new(RwLock::new(1i));
         let arc2 = arc.clone();
         let _: Result<uint, _> = Thread::spawn(move|| {
             let _lock = arc2.read().unwrap();
@@ -459,7 +465,7 @@ mod tests {
 
     #[test]
     fn test_rw_arc() {
-        let arc = Arc::new(RWLock::new(0i));
+        let arc = Arc::new(RwLock::new(0i));
         let arc2 = arc.clone();
         let (tx, rx) = channel();
 
@@ -497,11 +503,11 @@ mod tests {
 
     #[test]
     fn test_rw_arc_access_in_unwind() {
-        let arc = Arc::new(RWLock::new(1i));
+        let arc = Arc::new(RwLock::new(1i));
         let arc2 = arc.clone();
         let _ = Thread::spawn(move|| -> () {
             struct Unwinder {
-                i: Arc<RWLock<int>>,
+                i: Arc<RwLock<int>>,
             }
             impl Drop for Unwinder {
                 fn drop(&mut self) {
diff --git a/src/libstd/sync/semaphore.rs b/src/libstd/sync/semaphore.rs
index c0ff674ba0f..505819fbf8a 100644
--- a/src/libstd/sync/semaphore.rs
+++ b/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();