rollup merge of #20070: aturon/stab-2-clone

This patch marks `clone` stable, as well as the `Clone` trait, but
leaves `clone_from` unstable. The latter will be decided by the beta.

The patch also marks most manual implementations of `Clone` as stable,
except where the APIs are otherwise deprecated or where there is
uncertainty about providing `Clone`.

r? @alexcrichton

3 files changed, 3 insertions, 3 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 32d9097c45e..271cab393c4 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -197,7 +197,7 @@ pub fn weak_count<T>(this: &Arc<T>) -> uint { this.inner().weak.load(atomic::Seq
 #[experimental]
 pub fn strong_count<T>(this: &Arc<T>) -> uint { this.inner().strong.load(atomic::SeqCst) }
 
-#[unstable = "waiting on stability of Clone"]
+#[stable]
 impl<T> Clone for Arc<T> {
     /// Makes a clone of the `Arc<T>`.
     ///
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index ea7b32ace49..5fd234192c5 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -58,7 +58,7 @@ impl<T> Default for Box<[T]> {
     fn default() -> Box<[T]> { box [] }
 }
 
-#[unstable]
+#[stable]
 impl<T: Clone> Clone for Box<T> {
     /// Returns a copy of the owned box.
     #[inline]
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 2ee4483a919..dfa55848c90 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -410,7 +410,7 @@ impl<T> Drop for Rc<T> {
     }
 }
 
-#[unstable = "Clone is unstable."]
+#[stable]
 impl<T> Clone for Rc<T> {
     /// Makes a clone of the `Rc<T>`.
     ///