1 files changed, 8 insertions, 0 deletions
diff --git a/src/libsyntax/util/interner.rs b/src/libsyntax/util/interner.rs
index 4b5a05f4cb8..7b885df0317 100644
--- a/src/libsyntax/util/interner.rs
+++ b/src/libsyntax/util/interner.rs
@@ -18,6 +18,7 @@ use collections::HashMap;
 use std::cast;
 use std::cell::RefCell;
 use std::cmp::Equiv;
+use std::fmt;
 use std::hash::Hash;
 use std::rc::Rc;
 
@@ -114,6 +115,13 @@ impl Str for RcStr {
     }
 }
 
+impl fmt::Show for RcStr {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        use std::fmt::Show;
+        self.as_slice().fmt(f)
+    }
+}
+
 impl RcStr {
     pub fn new(string: &str) -> RcStr {
         RcStr {