Delete ctr-std to use my fork of the rust repo instead

1 files changed, 0 insertions, 716 deletions

diff --git a/ctr-std/src/sync/mutex.rs b/ctr-std/src/sync/mutex.rs
deleted file mode 100644
index e5a4106..0000000
--- a/ctr-std/src/sync/mutex.rs
+++ /dev/null
@@ -1,716 +0,0 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use cell::UnsafeCell;
-use fmt;
-use mem;
-use ops::{Deref, DerefMut};
-use ptr;
-use sys_common::mutex as sys;
-use sys_common::poison::{self, TryLockError, TryLockResult, LockResult};
-
-/// A mutual exclusion primitive useful for protecting shared data
-///
-/// This mutex will block threads waiting for the lock to become available. The
-/// mutex can also be statically initialized or created via a [`new`]
-/// constructor. Each mutex has a type parameter which represents the data that
-/// it is protecting. The data can only be accessed through the RAII guards
-/// returned from [`lock`] and [`try_lock`], which guarantees that the data is only
-/// ever accessed when the mutex is locked.
-///
-/// # Poisoning
-///
-/// The mutexes in this module implement a strategy called "poisoning" where a
-/// mutex is considered poisoned whenever a thread panics while holding the
-/// mutex. Once a mutex is poisoned, all other threads are unable to access the
-/// data by default as it is likely tainted (some invariant is not being
-/// upheld).
-///
-/// For a mutex, this means that the [`lock`] and [`try_lock`] methods return a
-/// [`Result`] which indicates whether a mutex has been poisoned or not. Most
-/// usage of a mutex will simply [`unwrap()`] these results, propagating panics
-/// among threads to ensure that a possibly invalid invariant is not witnessed.
-///
-/// A poisoned mutex, however, does not prevent all access to the underlying
-/// data. The [`PoisonError`] type has an [`into_inner`] method which will return
-/// the guard that would have otherwise been returned on a successful lock. This
-/// allows access to the data, despite the lock being poisoned.
-///
-/// [`new`]: #method.new
-/// [`lock`]: #method.lock
-/// [`try_lock`]: #method.try_lock
-/// [`Result`]: ../../std/result/enum.Result.html
-/// [`unwrap()`]: ../../std/result/enum.Result.html#method.unwrap
-/// [`PoisonError`]: ../../std/sync/struct.PoisonError.html
-/// [`into_inner`]: ../../std/sync/struct.PoisonError.html#method.into_inner
-///
-/// # Examples
-///
-/// ```
-/// use std::sync::{Arc, Mutex};
-/// use std::thread;
-/// use std::sync::mpsc::channel;
-///
-/// const N: usize = 10;
-///
-/// // Spawn a few threads to increment a shared variable (non-atomically), and
-/// // let the main thread know once all increments are done.
-/// //
-/// // Here we're using an Arc to share memory among threads, and the data inside
-/// // the Arc is protected with a mutex.
-/// let data = Arc::new(Mutex::new(0));
-///
-/// let (tx, rx) = channel();
-/// for _ in 0..N {
-///     let (data, tx) = (data.clone(), tx.clone());
-///     thread::spawn(move || {
-///         // The shared state can only be accessed once the lock is held.
-///         // Our non-atomic increment is safe because we're the only thread
-///         // which can access the shared state when the lock is held.
-///         //
-///         // We unwrap() the return value to assert that we are not expecting
-///         // threads to ever fail while holding the lock.
-///         let mut data = data.lock().unwrap();
-///         *data += 1;
-///         if *data == N {
-///             tx.send(()).unwrap();
-///         }
-///         // the lock is unlocked here when `data` goes out of scope.
-///     });
-/// }
-///
-/// rx.recv().unwrap();
-/// ```
-///
-/// To recover from a poisoned mutex:
-///
-/// ```
-/// use std::sync::{Arc, Mutex};
-/// use std::thread;
-///
-/// let lock = Arc::new(Mutex::new(0_u32));
-/// let lock2 = lock.clone();
-///
-/// let _ = thread::spawn(move || -> () {
-///     // This thread will acquire the mutex first, unwrapping the result of
-///     // `lock` because the lock has not been poisoned.
-///     let _guard = lock2.lock().unwrap();
-///
-///     // This panic while holding the lock (`_guard` is in scope) will poison
-///     // the mutex.
-///     panic!();
-/// }).join();
-///
-/// // The lock is poisoned by this point, but the returned result can be
-/// // pattern matched on to return the underlying guard on both branches.
-/// let mut guard = match lock.lock() {
-///     Ok(guard) => guard,
-///     Err(poisoned) => poisoned.into_inner(),
-/// };
-///
-/// *guard += 1;
-/// ```
-#[stable(feature = "rust1", since = "1.0.0")]
-pub struct Mutex<T: ?Sized> {
-    // Note that this mutex is in a *box*, not inlined into the struct itself.
-    // Once a native mutex has been used once, its address can never change (it
-    // can't be moved). This mutex type can be safely moved at any time, so to
-    // ensure that the native mutex is used correctly we box the inner mutex to
-    // give it a constant address.
-    inner: Box<sys::Mutex>,
-    poison: poison::Flag,
-    data: UnsafeCell<T>,
-}
-
-// these are the only places where `T: Send` matters; all other
-// functionality works fine on a single thread.
-#[stable(feature = "rust1", since = "1.0.0")]
-unsafe impl<T: ?Sized + Send> Send for Mutex<T> { }
-#[stable(feature = "rust1", since = "1.0.0")]
-unsafe impl<T: ?Sized + Send> Sync for Mutex<T> { }
-
-/// An RAII implementation of a "scoped lock" of a mutex. When this structure is
-/// dropped (falls out of scope), the lock will be unlocked.
-///
-/// The data protected by the mutex can be accessed through this guard via its
-/// [`Deref`] and [`DerefMut`] implementations.
-///
-/// This structure is created by the [`lock`] and [`try_lock`] methods on
-/// [`Mutex`].
-///
-/// [`Deref`]: ../../std/ops/trait.Deref.html
-/// [`DerefMut`]: ../../std/ops/trait.DerefMut.html
-/// [`lock`]: struct.Mutex.html#method.lock
-/// [`try_lock`]: struct.Mutex.html#method.try_lock
-/// [`Mutex`]: struct.Mutex.html
-#[must_use = "if unused the Mutex will immediately unlock"]
-#[stable(feature = "rust1", since = "1.0.0")]
-pub struct MutexGuard<'a, T: ?Sized + 'a> {
-    // funny underscores due to how Deref/DerefMut currently work (they
-    // disregard field privacy).
-    __lock: &'a Mutex<T>,
-    __poison: poison::Guard,
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T: ?Sized> !Send for MutexGuard<'a, T> { }
-#[stable(feature = "mutexguard", since = "1.19.0")]
-unsafe impl<'a, T: ?Sized + Sync> Sync for MutexGuard<'a, T> { }
-
-impl<T> Mutex<T> {
-    /// Creates a new mutex in an unlocked state ready for use.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::Mutex;
-    ///
-    /// let mutex = Mutex::new(0);
-    /// ```
-    #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn new(t: T) -> Mutex<T> {
-        let mut m = Mutex {
-            inner: box sys::Mutex::new(),
-            poison: poison::Flag::new(),
-            data: UnsafeCell::new(t),
-        };
-        unsafe {
-            m.inner.init();
-        }
-        m
-    }
-}
-
-impl<T: ?Sized> Mutex<T> {
-    /// Acquires a mutex, blocking the current thread until it is able to do so.
-    ///
-    /// This function will block the local thread until it is available to acquire
-    /// the mutex. Upon returning, the thread is the only thread with the lock
-    /// held. An RAII guard is returned to allow scoped unlock of the lock. When
-    /// the guard goes out of scope, the mutex will be unlocked.
-    ///
-    /// The exact behavior on locking a mutex in the thread which already holds
-    /// the lock is left unspecified. However, this function will not return on
-    /// the second call (it might panic or deadlock, for example).
-    ///
-    /// # Errors
-    ///
-    /// If another user of this mutex panicked while holding the mutex, then
-    /// this call will return an error once the mutex is acquired.
-    ///
-    /// # Panics
-    ///
-    /// This function might panic when called if the lock is already held by
-    /// the current thread.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::{Arc, Mutex};
-    /// use std::thread;
-    ///
-    /// let mutex = Arc::new(Mutex::new(0));
-    /// let c_mutex = mutex.clone();
-    ///
-    /// thread::spawn(move || {
-    ///     *c_mutex.lock().unwrap() = 10;
-    /// }).join().expect("thread::spawn failed");
-    /// assert_eq!(*mutex.lock().unwrap(), 10);
-    /// ```
-    #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn lock(&self) -> LockResult<MutexGuard<T>> {
-        unsafe {
-            self.inner.raw_lock();
-            MutexGuard::new(self)
-        }
-    }
-
-    /// Attempts to acquire this lock.
-    ///
-    /// If the lock could not be acquired at this time, then [`Err`] is returned.
-    /// Otherwise, an RAII guard is returned. The lock will be unlocked when the
-    /// guard is dropped.
-    ///
-    /// This function does not block.
-    ///
-    /// # Errors
-    ///
-    /// If another user of this mutex panicked while holding the mutex, then
-    /// this call will return failure if the mutex would otherwise be
-    /// acquired.
-    ///
-    /// [`Err`]: ../../std/result/enum.Result.html#variant.Err
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::{Arc, Mutex};
-    /// use std::thread;
-    ///
-    /// let mutex = Arc::new(Mutex::new(0));
-    /// let c_mutex = mutex.clone();
-    ///
-    /// thread::spawn(move || {
-    ///     let mut lock = c_mutex.try_lock();
-    ///     if let Ok(ref mut mutex) = lock {
-    ///         **mutex = 10;
-    ///     } else {
-    ///         println!("try_lock failed");
-    ///     }
-    /// }).join().expect("thread::spawn failed");
-    /// assert_eq!(*mutex.lock().unwrap(), 10);
-    /// ```
-    #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn try_lock(&self) -> TryLockResult<MutexGuard<T>> {
-        unsafe {
-            if self.inner.try_lock() {
-                Ok(MutexGuard::new(self)?)
-            } else {
-                Err(TryLockError::WouldBlock)
-            }
-        }
-    }
-
-    /// Determines whether the mutex is poisoned.
-    ///
-    /// If another thread is active, the mutex can still become poisoned at any
-    /// time. You should not trust a `false` value for program correctness
-    /// without additional synchronization.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::{Arc, Mutex};
-    /// use std::thread;
-    ///
-    /// let mutex = Arc::new(Mutex::new(0));
-    /// let c_mutex = mutex.clone();
-    ///
-    /// let _ = thread::spawn(move || {
-    ///     let _lock = c_mutex.lock().unwrap();
-    ///     panic!(); // the mutex gets poisoned
-    /// }).join();
-    /// assert_eq!(mutex.is_poisoned(), true);
-    /// ```
-    #[inline]
-    #[stable(feature = "sync_poison", since = "1.2.0")]
-    pub fn is_poisoned(&self) -> bool {
-        self.poison.get()
-    }
-
-    /// Consumes this mutex, returning the underlying data.
-    ///
-    /// # Errors
-    ///
-    /// If another user of this mutex panicked while holding the mutex, then
-    /// this call will return an error instead.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::Mutex;
-    ///
-    /// let mutex = Mutex::new(0);
-    /// assert_eq!(mutex.into_inner().unwrap(), 0);
-    /// ```
-    #[stable(feature = "mutex_into_inner", since = "1.6.0")]
-    pub fn into_inner(self) -> LockResult<T> where T: Sized {
-        // We know statically that there are no outstanding references to
-        // `self` so there's no need to lock the inner mutex.
-        //
-        // To get the inner value, we'd like to call `data.into_inner()`,
-        // but because `Mutex` impl-s `Drop`, we can't move out of it, so
-        // we'll have to destructure it manually instead.
-        unsafe {
-            // Like `let Mutex { inner, poison, data } = self`.
-            let (inner, poison, data) = {
-                let Mutex { ref inner, ref poison, ref data } = self;
-                (ptr::read(inner), ptr::read(poison), ptr::read(data))
-            };
-            mem::forget(self);
-            inner.destroy();  // Keep in sync with the `Drop` impl.
-            drop(inner);
-
-            poison::map_result(poison.borrow(), |_| data.into_inner())
-        }
-    }
-
-    /// Returns a mutable reference to the underlying data.
-    ///
-    /// Since this call borrows the `Mutex` mutably, no actual locking needs to
-    /// take place---the mutable borrow statically guarantees no locks exist.
-    ///
-    /// # Errors
-    ///
-    /// If another user of this mutex panicked while holding the mutex, then
-    /// this call will return an error instead.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::sync::Mutex;
-    ///
-    /// let mut mutex = Mutex::new(0);
-    /// *mutex.get_mut().unwrap() = 10;
-    /// assert_eq!(*mutex.lock().unwrap(), 10);
-    /// ```
-    #[stable(feature = "mutex_get_mut", since = "1.6.0")]
-    pub fn get_mut(&mut self) -> LockResult<&mut T> {
-        // We know statically that there are no other references to `self`, so
-        // there's no need to lock the inner mutex.
-        let data = unsafe { &mut *self.data.get() };
-        poison::map_result(self.poison.borrow(), |_| data )
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-unsafe impl<#[may_dangle] T: ?Sized> Drop for Mutex<T> {
-    fn drop(&mut self) {
-        // This is actually safe b/c we know that there is no further usage of
-        // this mutex (it's up to the user to arrange for a mutex to get
-        // dropped, that's not our job)
-        //
-        // IMPORTANT: This code must be kept in sync with `Mutex::into_inner`.
-        unsafe { self.inner.destroy() }
-    }
-}
-
-#[stable(feature = "mutex_from", since = "1.24.0")]
-impl<T> From<T> for Mutex<T> {
-    /// Creates a new mutex in an unlocked state ready for use.
-    /// This is equivalent to [`Mutex::new`].
-    ///
-    /// [`Mutex::new`]: #method.new
-    fn from(t: T) -> Self {
-        Mutex::new(t)
-    }
-}
-
-#[stable(feature = "mutex_default", since = "1.10.0")]
-impl<T: ?Sized + Default> Default for Mutex<T> {
-    /// Creates a `Mutex<T>`, with the `Default` value for T.
-    fn default() -> Mutex<T> {
-        Mutex::new(Default::default())
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self.try_lock() {
-            Ok(guard) => f.debug_struct("Mutex").field("data", &&*guard).finish(),
-            Err(TryLockError::Poisoned(err)) => {
-                f.debug_struct("Mutex").field("data", &&**err.get_ref()).finish()
-            },
-            Err(TryLockError::WouldBlock) => {
-                struct LockedPlaceholder;
-                impl fmt::Debug for LockedPlaceholder {
-                    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.write_str("<locked>") }
-                }
-
-                f.debug_struct("Mutex").field("data", &LockedPlaceholder).finish()
-            }
-        }
-    }
-}
-
-impl<'mutex, T: ?Sized> MutexGuard<'mutex, T> {
-    unsafe fn new(lock: &'mutex Mutex<T>) -> LockResult<MutexGuard<'mutex, T>> {
-        poison::map_result(lock.poison.borrow(), |guard| {
-            MutexGuard {
-                __lock: lock,
-                __poison: guard,
-            }
-        })
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'mutex, T: ?Sized> Deref for MutexGuard<'mutex, T> {
-    type Target = T;
-
-    fn deref(&self) -> &T {
-        unsafe { &*self.__lock.data.get() }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'mutex, T: ?Sized> DerefMut for MutexGuard<'mutex, T> {
-    fn deref_mut(&mut self) -> &mut T {
-        unsafe { &mut *self.__lock.data.get() }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, T: ?Sized> Drop for MutexGuard<'a, T> {
-    #[inline]
-    fn drop(&mut self) {
-        unsafe {
-            self.__lock.poison.done(&self.__poison);
-            self.__lock.inner.raw_unlock();
-        }
-    }
-}
-
-#[stable(feature = "std_debug", since = "1.16.0")]
-impl<'a, T: ?Sized + fmt::Debug> fmt::Debug for MutexGuard<'a, T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_struct("MutexGuard")
-            .field("lock", &self.__lock)
-            .finish()
-    }
-}
-
-#[stable(feature = "std_guard_impls", since = "1.20.0")]
-impl<'a, T: ?Sized + fmt::Display> fmt::Display for MutexGuard<'a, T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        (**self).fmt(f)
-    }
-}
-
-pub fn guard_lock<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a sys::Mutex {
-    &guard.__lock.inner
-}
-
-pub fn guard_poison<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a poison::Flag {
-    &guard.__lock.poison
-}
-
-#[cfg(all(test, not(target_os = "emscripten")))]
-mod tests {
-    use sync::mpsc::channel;
-    use sync::{Arc, Mutex, Condvar};
-    use sync::atomic::{AtomicUsize, Ordering};
-    use thread;
-
-    struct Packet<T>(Arc<(Mutex<T>, Condvar)>);
-
-    #[derive(Eq, PartialEq, Debug)]
-    struct NonCopy(i32);
-
-    #[test]
-    fn smoke() {
-        let m = Mutex::new(());
-        drop(m.lock().unwrap());
-        drop(m.lock().unwrap());
-    }
-
-    #[test]
-    fn lots_and_lots() {
-        const J: u32 = 1000;
-        const K: u32 = 3;
-
-        let m = Arc::new(Mutex::new(0));
-
-        fn inc(m: &Mutex<u32>) {
-            for _ in 0..J {
-                *m.lock().unwrap() += 1;
-            }
-        }
-
-        let (tx, rx) = channel();
-        for _ in 0..K {
-            let tx2 = tx.clone();
-            let m2 = m.clone();
-            thread::spawn(move|| { inc(&m2); tx2.send(()).unwrap(); });
-            let tx2 = tx.clone();
-            let m2 = m.clone();
-            thread::spawn(move|| { inc(&m2); tx2.send(()).unwrap(); });
-        }
-
-        drop(tx);
-        for _ in 0..2 * K {
-            rx.recv().unwrap();
-        }
-        assert_eq!(*m.lock().unwrap(), J * K * 2);
-    }
-
-    #[test]
-    fn try_lock() {
-        let m = Mutex::new(());
-        *m.try_lock().unwrap() = ();
-    }
-
-    #[test]
-    fn test_into_inner() {
-        let m = Mutex::new(NonCopy(10));
-        assert_eq!(m.into_inner().unwrap(), NonCopy(10));
-    }
-
-    #[test]
-    fn test_into_inner_drop() {
-        struct Foo(Arc<AtomicUsize>);
-        impl Drop for Foo {
-            fn drop(&mut self) {
-                self.0.fetch_add(1, Ordering::SeqCst);
-            }
-        }
-        let num_drops = Arc::new(AtomicUsize::new(0));
-        let m = Mutex::new(Foo(num_drops.clone()));
-        assert_eq!(num_drops.load(Ordering::SeqCst), 0);
-        {
-            let _inner = m.into_inner().unwrap();
-            assert_eq!(num_drops.load(Ordering::SeqCst), 0);
-        }
-        assert_eq!(num_drops.load(Ordering::SeqCst), 1);
-    }
-
-    #[test]
-    fn test_into_inner_poison() {
-        let m = Arc::new(Mutex::new(NonCopy(10)));
-        let m2 = m.clone();
-        let _ = thread::spawn(move || {
-            let _lock = m2.lock().unwrap();
-            panic!("test panic in inner thread to poison mutex");
-        }).join();
-
-        assert!(m.is_poisoned());
-        match Arc::try_unwrap(m).unwrap().into_inner() {
-            Err(e) => assert_eq!(e.into_inner(), NonCopy(10)),
-            Ok(x) => panic!("into_inner of poisoned Mutex is Ok: {:?}", x),
-        }
-    }
-
-    #[test]
-    fn test_get_mut() {
-        let mut m = Mutex::new(NonCopy(10));
-        *m.get_mut().unwrap() = NonCopy(20);
-        assert_eq!(m.into_inner().unwrap(), NonCopy(20));
-    }
-
-    #[test]
-    fn test_get_mut_poison() {
-        let m = Arc::new(Mutex::new(NonCopy(10)));
-        let m2 = m.clone();
-        let _ = thread::spawn(move || {
-            let _lock = m2.lock().unwrap();
-            panic!("test panic in inner thread to poison mutex");
-        }).join();
-
-        assert!(m.is_poisoned());
-        match Arc::try_unwrap(m).unwrap().get_mut() {
-            Err(e) => assert_eq!(*e.into_inner(), NonCopy(10)),
-            Ok(x) => panic!("get_mut of poisoned Mutex is Ok: {:?}", x),
-        }
-    }
-
-    #[test]
-    fn test_mutex_arc_condvar() {
-        let packet = Packet(Arc::new((Mutex::new(false), Condvar::new())));
-        let packet2 = Packet(packet.0.clone());
-        let (tx, rx) = channel();
-        let _t = thread::spawn(move|| {
-            // wait until parent gets in
-            rx.recv().unwrap();
-            let &(ref lock, ref cvar) = &*packet2.0;
-            let mut lock = lock.lock().unwrap();
-            *lock = true;
-            cvar.notify_one();
-        });
-
-        let &(ref lock, ref cvar) = &*packet.0;
-        let mut lock = lock.lock().unwrap();
-        tx.send(()).unwrap();
-        assert!(!*lock);
-        while !*lock {
-            lock = cvar.wait(lock).unwrap();
-        }
-    }
-
-    #[test]
-    fn test_arc_condvar_poison() {
-        let packet = Packet(Arc::new((Mutex::new(1), Condvar::new())));
-        let packet2 = Packet(packet.0.clone());
-        let (tx, rx) = channel();
-
-        let _t = thread::spawn(move || -> () {
-            rx.recv().unwrap();
-            let &(ref lock, ref cvar) = &*packet2.0;
-            let _g = lock.lock().unwrap();
-            cvar.notify_one();
-            // Parent should fail when it wakes up.
-            panic!();
-        });
-
-        let &(ref lock, ref cvar) = &*packet.0;
-        let mut lock = lock.lock().unwrap();
-        tx.send(()).unwrap();
-        while *lock == 1 {
-            match cvar.wait(lock) {
-                Ok(l) => {
-                    lock = l;
-                    assert_eq!(*lock, 1);
-                }
-                Err(..) => break,
-            }
-        }
-    }
-
-    #[test]
-    fn test_mutex_arc_poison() {
-        let arc = Arc::new(Mutex::new(1));
-        assert!(!arc.is_poisoned());
-        let arc2 = arc.clone();
-        let _ = thread::spawn(move|| {
-            let lock = arc2.lock().unwrap();
-            assert_eq!(*lock, 2);
-        }).join();
-        assert!(arc.lock().is_err());
-        assert!(arc.is_poisoned());
-    }
-
-    #[test]
-    fn test_mutex_arc_nested() {
-        // Tests nested mutexes and access
-        // to underlying data.
-        let arc = Arc::new(Mutex::new(1));
-        let arc2 = Arc::new(Mutex::new(arc));
-        let (tx, rx) = channel();
-        let _t = thread::spawn(move|| {
-            let lock = arc2.lock().unwrap();
-            let lock2 = lock.lock().unwrap();
-            assert_eq!(*lock2, 1);
-            tx.send(()).unwrap();
-        });
-        rx.recv().unwrap();
-    }
-
-    #[test]
-    fn test_mutex_arc_access_in_unwind() {
-        let arc = Arc::new(Mutex::new(1));
-        let arc2 = arc.clone();
-        let _ = thread::spawn(move|| -> () {
-            struct Unwinder {
-                i: Arc<Mutex<i32>>,
-            }
-            impl Drop for Unwinder {
-                fn drop(&mut self) {
-                    *self.i.lock().unwrap() += 1;
-                }
-            }
-            let _u = Unwinder { i: arc2 };
-            panic!();
-        }).join();
-        let lock = arc.lock().unwrap();
-        assert_eq!(*lock, 2);
-    }
-
-    #[test]
-    fn test_mutex_unsized() {
-        let mutex: &Mutex<[i32]> = &Mutex::new([1, 2, 3]);
-        {
-            let b = &mut *mutex.lock().unwrap();
-            b[0] = 4;
-            b[2] = 5;
-        }
-        let comp: &[i32] = &[4, 2, 5];
-        assert_eq!(&*mutex.lock().unwrap(), comp);
-    }
-}