std: Stabilize the sync_poison feature

These accessor/constructor methods for a `PoisonError` are quite standard for a
wrapper type and enable manipulation of the underlying type.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index 1d630142959..64a5027cc89 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -238,7 +238,7 @@ impl<T: ?Sized> Mutex<T> {
     /// time.  You should not trust a `false` value for program correctness
     /// without additional synchronization.
     #[inline]
-    #[unstable(feature = "sync_poison")]
+    #[stable(feature = "sync_poison", since = "1.2.0")]
     pub fn is_poisoned(&self) -> bool {
         self.inner.poison.get()
     }
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index 5a6bf987fd7..4ca2e282f70 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -253,7 +253,7 @@ impl<T: ?Sized> RwLock<T> {
     /// time.  You should not trust a `false` value for program correctness
     /// without additional synchronization.
     #[inline]
-    #[unstable(feature = "sync_poison")]
+    #[stable(feature = "sync_poison", since = "1.2.0")]
     pub fn is_poisoned(&self) -> bool {
         self.inner.poison.get()
     }