Auto merge of #29952 - petrochenkov:depr, r=brson

Part of https://github.com/rust-lang/rust/issues/29935

The deprecation lint is still called "deprecated", so people can continue using `#[allow(deprecated)]` and similar things.

3 files changed, 4 insertions, 2 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 7863f101811..dba9b71c61c 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -385,7 +385,7 @@ impl<T: ?Sized> Deref for Arc<T> {
 impl<T: Clone> Arc<T> {
     #[unstable(feature = "arc_make_unique", reason = "renamed to Arc::make_mut",
                issue = "27718")]
-    #[deprecated(since = "1.4.0", reason = "renamed to Arc::make_mut")]
+    #[rustc_deprecated(since = "1.4.0", reason = "renamed to Arc::make_mut")]
     pub fn make_unique(this: &mut Self) -> &mut T {
         Arc::make_mut(this)
     }
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 4113f67e617..3e87b7ebea8 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -74,6 +74,8 @@
 #![no_std]
 #![cfg_attr(not(stage0), needs_allocator)]
 
+#![cfg_attr(stage0, feature(rustc_attrs))]
+#![cfg_attr(stage0, allow(unused_attributes))]
 #![feature(allocator)]
 #![feature(box_syntax)]
 #![feature(coerce_unsized)]
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 7abdc447ee5..0ea5ecfda79 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -362,7 +362,7 @@ impl<T: Clone> Rc<T> {
     #[inline]
     #[unstable(feature = "rc_make_unique", reason = "renamed to Rc::make_mut",
                issue = "27718")]
-    #[deprecated(since = "1.4.0", reason = "renamed to Rc::make_mut")]
+    #[rustc_deprecated(since = "1.4.0", reason = "renamed to Rc::make_mut")]
     pub fn make_unique(&mut self) -> &mut T {
         Rc::make_mut(self)
     }