remove no-op 'let _ = '

diff --git a/library/std/src/sync/mpsc/mod.rs b/library/std/src/sync/mpsc/mod.rs
index 27fba761ada108c191ec9cbe9ddcea4c3b33ee95..adb488d4378f0391140e6eadf604603720f8776f 100644 (file)
--- a/library/std/src/sync/mpsc/mod.rs
+++ b/library/std/src/sync/mpsc/mod.rs
@@ -629,9 +629,7 @@ fn clone(&self) -> Sender<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Drop for Sender<T> {
-    fn drop(&mut self) {
-        let _ = self.inner;
-    }
+    fn drop(&mut self) {}
 }
 
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
@@ -751,9 +749,7 @@ fn clone(&self) -> SyncSender<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Drop for SyncSender<T> {
-    fn drop(&mut self) {
-        let _ = self.inner;
-    }
+    fn drop(&mut self) {}
 }
 
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
@@ -1094,9 +1090,7 @@ fn into_iter(self) -> IntoIter<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Drop for Receiver<T> {
-    fn drop(&mut self) {
-        let _ = self.inner;
-    }
+    fn drop(&mut self) {}
 }
 
 #[stable(feature = "mpsc_debug", since = "1.8.0")]