Switch to purely namespaced enums

This breaks code that referred to variant names in the same namespace as
their enum. Reexport the variants in the old location or alter code to
refer to the new locations:

```
pub enum Foo {
    A,
    B
}

fn main() {
    let a = A;
}
```
=>
```
pub use self::Foo::{A, B};

pub enum Foo {
    A,
    B
}

fn main() {
    let a = A;
}
```
or
```
pub enum Foo {
    A,
    B
}

fn main() {
    let a = Foo::A;
}
```

[breaking-change]

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libsync/lock.rs b/src/libsync/lock.rs
index 0ef3e77da00..d6378c2190e 100644
--- a/src/libsync/lock.rs
+++ b/src/libsync/lock.rs
@@ -21,6 +21,8 @@
 
 use core::prelude::*;
 
+use self::Inner::*;
+
 use core::cell::UnsafeCell;
 use rustrt::local::Local;
 use rustrt::task::Task;