rustc: Update how Gc<T> is recognized

This commit uses the same trick as ~/Box to map Gc<T> to @T internally inside
the compiler. This moves a number of implementations of traits to the `gc`
module in the standard library.

This removes functions such as `Gc::new`, `Gc::borrow`, and `Gc::ptr_eq` in
favor of the more modern equivalents, `box(GC)`, `Deref`, and pointer equality.

The Gc pointer itself should be much more useful now, and subsequent commits
will move the compiler away from @T towards Gc<T>

[breaking-change]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 416a6ad2d8b..8b28ab917b3 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -320,8 +320,8 @@ mod tests {
     #[test]
     fn gc_inside() {
         // see issue #11532
-        use std::gc::Gc;
-        let a = Rc::new(RefCell::new(Gc::new(1)));
+        use realstd::gc::Gc;
+        let a = Rc::new(RefCell::new(box(GC) 1));
         assert!(a.try_borrow_mut().is_some());
     }