Use private trait for Rc/Arc Eq specialization

1 files changed, 37 insertions, 17 deletions

diff --git a/src/liballoc/sync.rs b/src/liballoc/sync.rs
index d6863238cd4..e596694fb9d 100644
--- a/src/liballoc/sync.rs
+++ b/src/liballoc/sync.rs
@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(specialization)]
 #![stable(feature = "rust1", since = "1.0.0")]
 
 //! Thread-safe reference-counting pointers.
@@ -1289,6 +1288,37 @@ impl<T: ?Sized> Drop for Weak<T> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
+trait ArcEqIdent<T: ?Sized + PartialEq> {
+    fn eq(&self, other: &Arc<T>) -> bool;
+    fn ne(&self, other: &Arc<T>) -> bool;
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T: ?Sized + PartialEq> ArcEqIdent<T> for Arc<T> {
+    #[inline]
+    default fn eq(&self, other: &Arc<T>) -> bool {
+        **self == **other
+    }
+    #[inline]
+    default fn ne(&self, other: &Arc<T>) -> bool {
+        **self != **other
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T: ?Sized + Eq> ArcEqIdent<T> for Arc<T> {
+    #[inline]
+    fn eq(&self, other: &Arc<T>) -> bool {
+        Arc::ptr_eq(self, other) || **self == **other
+    }
+
+    #[inline]
+    fn ne(&self, other: &Arc<T>) -> bool {
+        !Arc::ptr_eq(self, other) && **self != **other
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + PartialEq> PartialEq for Arc<T> {
     /// Equality for two `Arc`s.
     ///
@@ -1306,8 +1336,9 @@ impl<T: ?Sized + PartialEq> PartialEq for Arc<T> {
     ///
     /// assert!(five == Arc::new(5));
     /// ```
-    default fn eq(&self, other: &Arc<T>) -> bool {
-        **self == **other
+    #[inline]
+    fn eq(&self, other: &Arc<T>) -> bool {
+        ArcEqIdent::eq(self, other)
     }
 
     /// Inequality for two `Arc`s.
@@ -1326,23 +1357,12 @@ impl<T: ?Sized + PartialEq> PartialEq for Arc<T> {
     ///
     /// assert!(five != Arc::new(6));
     /// ```
-    default fn ne(&self, other: &Arc<T>) -> bool {
-        **self != **other
-    }
-}
-#[doc(hidden)]
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T: ?Sized + Eq> PartialEq for Arc<T> {
-    #[inline(always)]
-    fn eq(&self, other: &Arc<T>) -> bool {
-        Arc::ptr_eq(self, other) || **self == **other
-    }
-
-    #[inline(always)]
+    #[inline]
     fn ne(&self, other: &Arc<T>) -> bool {
-        !Arc::ptr_eq(self, other) && **self != **other
+        ArcEqIdent::ne(self, other)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + PartialOrd> PartialOrd for Arc<T> {
     /// Partial comparison for two `Arc`s.