From 7fbc3895e359b9212bc0a78692198f15bbe462b5 Mon Sep 17 00:00:00 2001
From: Thayne McCombs <astrothayne@gmail.com>
Date: Fri, 6 Jul 2018 01:00:40 -0600
Subject: [PATCH] Stabilize rc_downcast

Fixes #44608
---
 src/liballoc/rc.rs   | 3 +--
 src/liballoc/sync.rs | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 32d624e8fbc79..357bc8ba2dd21 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -620,13 +620,12 @@ impl<T: Clone> Rc<T> {
 
 impl Rc<Any> {
     #[inline]
-    #[unstable(feature = "rc_downcast", issue = "44608")]
+    #[stable(feature = "rc_downcast", since = "1.29.0")]
     /// Attempt to downcast the `Rc<Any>` to a concrete type.
     ///
     /// # Examples
     ///
     /// ```
-    /// #![feature(rc_downcast)]
     /// use std::any::Any;
     /// use std::rc::Rc;
     ///
diff --git a/src/liballoc/sync.rs b/src/liballoc/sync.rs
index 2abd9c85c5754..dcc3560a0709a 100644
--- a/src/liballoc/sync.rs
+++ b/src/liballoc/sync.rs
@@ -981,13 +981,12 @@ unsafe impl<#[may_dangle] T: ?Sized> Drop for Arc<T> {
 
 impl Arc<Any + Send + Sync> {
     #[inline]
-    #[unstable(feature = "rc_downcast", issue = "44608")]
+    #[stable(feature = "rc_downcast", since = "1.29.0")]
     /// Attempt to downcast the `Arc<Any + Send + Sync>` to a concrete type.
     ///
     /// # Examples
     ///
     /// ```
-    /// #![feature(rc_downcast)]
     /// use std::any::Any;
     /// use std::sync::Arc;
     ///