librustc: Remove `~EXPR`, `~TYPE`, and `~PAT` from the language, except

for `~str`/`~[]`.

Note that `~self` still remains, since I forgot to add support for
`Box<self>` before the snapshot.

How to update your code:

* Instead of `~EXPR`, you should write `box EXPR`.

* Instead of `~TYPE`, you should write `Box<Type>`.

* Instead of `~PATTERN`, you should write `box PATTERN`.

[breaking-change]

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libstd/sync/arc.rs b/src/libstd/sync/arc.rs
index 0cf975a4c1c..d277c514e44 100644
--- a/src/libstd/sync/arc.rs
+++ b/src/libstd/sync/arc.rs
@@ -26,6 +26,7 @@ use clone::Clone;
 use iter::Iterator;
 use kinds::Send;
 use ops::Drop;
+use owned::Box;
 use ptr::RawPtr;
 use sync::atomics::{fence, AtomicUint, Relaxed, Acquire, Release};
 use ty::Unsafe;
@@ -157,7 +158,7 @@ impl<T> Drop for UnsafeArc<T>{
                 //  happened before), and an "acquire" operation before deleting the object.
                 // [1]: (www.boost.org/doc/libs/1_55_0/doc/html/atomic/usage_examples.html)
                 fence(Acquire);
-                let _: ~ArcData<T> = cast::transmute(self.data);
+                let _: Box<ArcData<T>> = cast::transmute(self.data);
             }
         }
     }