bors d98668a559 auto merge of #12235 : huonw/rust/raii-lock, r=alexcrichton
- adds a `LockGuard` type returned by `.lock` and `.trylock` that unlocks the mutex in the destructor
- renames `mutex::Mutex` to `StaticNativeMutex` 
- adds a `NativeMutex` type with a destructor
- removes `LittleLock`
- adds `#[must_use]` to `sync::mutex::Guard` to remind people to use it
2014-02-15 15:21:28 -08:00
..
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