rollup merge of #20722: alexcrichton/audit-show

Conflicts:
	src/libcollections/vec.rs
	src/libcore/fmt/mod.rs
	src/librustdoc/html/format.rs

1 files changed, 7 insertions, 0 deletions

diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 83eff71e2b8..27b3f03002f 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -622,6 +622,13 @@ impl<T: fmt::Show> fmt::Show for Rc<T> {
     }
 }
 
+#[stable]
+impl<T: fmt::String> fmt::String for Rc<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::String::fmt(&**self, f)
+    }
+}
+
 /// A weak version of `Rc<T>`.
 ///
 /// Weak references do not count when determining if the inner value should be dropped.