Remove Drop impl of mpsc Receiver and (Sync)Sender

Author: benschulz

std/src/sync/mpsc/mod.rs

@@ -626,11 +626,6 @@ impl<T> Clone for Sender<T> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T> Drop for Sender<T> {
-    fn drop(&mut self) {}
-}
-
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for Sender<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -755,11 +750,6 @@ impl<T> Clone for SyncSender<T> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T> Drop for SyncSender<T> {
-    fn drop(&mut self) {}
-}
-
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for SyncSender<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -1096,11 +1086,6 @@ impl<T> IntoIterator for Receiver<T> {
     }
 }
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T> Drop for Receiver<T> {
-    fn drop(&mut self) {}
-}
-
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for Receiver<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {