Added doc and stable annotations to sync::mpsc::IntoIter and removed core:: prefix on imports

Author: rapha

src/libstd/sync/mpsc/mod.rs

@@ -277,7 +277,7 @@ pub use self::select::{Select, Handle};
 use self::select::StartResult;
 use self::select::StartResult::*;
 use self::blocking::SignalToken;
-use core::iter::IntoIterator;
+use iter::IntoIterator;
 
 mod blocking;
 mod oneshot;
@@ -307,6 +307,10 @@ pub struct Iter<'a, T: 'a> {
     rx: &'a Receiver<T>
 }
 
+/// An owning iterator over messages on a receiver, this iterator will block
+/// whenever `next` is called, waiting for a new message, and `None` will be
+/// returned when the corresponding channel has hung up.
+#[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<T> {
     rx: Receiver<T>
 }
@@ -1528,7 +1532,7 @@ mod test {
 
     #[test]
     fn test_recv_into_iter() {
-        use core::iter::IntoIterator;
+        use iter::IntoIterator;
 
         let mut iter = {
           let (tx, rx) = channel::<i32>();