2 files changed, 5 insertions, 4 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index ee6ba3f438f..62bc1991cc9 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -205,9 +205,10 @@
 // Don't link to std. We are std.
 #![no_std]
 
-#![deny(missing_docs)]
-#![deny(intra_doc_link_resolution_failure)]
-#![deny(missing_debug_implementations)]
+//#![warn(deprecated_in_future)] // FIXME: std still has quite a few uses of `mem::uninitialized`
+#![warn(missing_docs)]
+#![warn(missing_debug_implementations)]
+#![deny(intra_doc_link_resolution_failure)] // rustdoc is run without -D warnings
 
 #![deny(rust_2018_idioms)]
 #![allow(explicit_outlives_requirements)]
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;