Deprecated attributes don't take 'feature' names and are paired with stable/unstable

Conflicts:
	src/libcore/atomic.rs
	src/libcore/finally.rs
	src/test/auxiliary/inherited_stability.rs
	src/test/auxiliary/lint_stability.rs

src/libsyntax/ext/base.rs

@@ -568,7 +568,8 @@ impl<'a> ExtCtxt<'a> {
         }
     }
 
-    #[deprecated(feature = "oldstuff", since = "1.0.0",
+    #[unstable(feature = "rustc_private")]
+    #[deprecated(since = "1.0.0",
                  reason = "Replaced with `expander().fold_expr()`")]
     pub fn expand_expr(&mut self, e: P<ast::Expr>) -> P<ast::Expr> {
         self.expander().fold_expr(e)