Rollup merge of #59648 - alex:must-use-result, r=alexcrichton

Add must_use annotations to Result::is_ok and is_err

Discussed in #59610

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index bc32b8e47b3..685c7909ff2 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -1005,7 +1005,7 @@ impl<T> SyncSender<T> {
     /// thread::spawn(move || {
     ///     // This will return an error and send
     ///     // no message if the buffer is full
-    ///     sync_sender2.try_send(3).is_err();
+    ///     let _ = sync_sender2.try_send(3);
     /// });
     ///
     /// let mut msg;