#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T: Send> Send for Receiver<T> { }
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T> !Sync for Receiver<T> { }
+
/// An 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")]
unsafe impl<T: Send> Send for Sender<T> { }
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T> !Sync for Sender<T> { }
+
/// The sending-half of Rust's synchronous channel type. This half can only be
/// owned by one thread, but it can be cloned to send to other threads.
#[stable(feature = "rust1", since = "1.0.0")]