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

2 files changed, 3 insertions, 2 deletions

diff --git a/src/libstd/comm/mod.rs b/src/libstd/comm/mod.rs
index 9043cb8c7d6..55f5662dbd8 100644
--- a/src/libstd/comm/mod.rs
+++ b/src/libstd/comm/mod.rs
@@ -628,7 +628,7 @@ impl<T: Send> Sender<T> {
     }
 }
 
-#[unstable]
+#[stable]
 impl<T: Send> Clone for Sender<T> {
     fn clone(&self) -> Sender<T> {
         let (packet, sleeper, guard) = match *unsafe { self.inner() } {
@@ -756,7 +756,7 @@ impl<T: Send> SyncSender<T> {
     }
 }
 
-#[unstable]
+#[stable]
 impl<T: Send> Clone for SyncSender<T> {
     fn clone(&self) -> SyncSender<T> {
         unsafe { (*self.inner.get()).clone_chan(); }
diff --git a/src/libstd/io/comm_adapters.rs b/src/libstd/io/comm_adapters.rs
index e865bf42bd0..3a18b0dc1b5 100644
--- a/src/libstd/io/comm_adapters.rs
+++ b/src/libstd/io/comm_adapters.rs
@@ -132,6 +132,7 @@ impl ChanWriter {
     }
 }
 
+#[stable]
 impl Clone for ChanWriter {
     fn clone(&self) -> ChanWriter {
         ChanWriter { tx: self.tx.clone() }