1 files changed, 8 insertions, 0 deletions
diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 3830d7fe295..343ede4e2cf 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -605,11 +605,19 @@ impl<T: Default + Sync + Send> Default for Arc<T> {
     fn default() -> Arc<T> { Arc::new(Default::default()) }
 }
 
+#[cfg(stage0)]
 impl<H: Hasher, T: Hash<H>> Hash<H> for Arc<T> {
     fn hash(&self, state: &mut H) {
         (**self).hash(state)
     }
 }
+#[cfg(not(stage0))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T: Hash> Hash for Arc<T> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        (**self).hash(state)
+    }
+}
 
 #[cfg(test)]
 mod tests {