1 files changed, 1 insertions, 7 deletions
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index c413439cb53..0882e8eb692 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -123,7 +123,7 @@ pub enum ElementKind {
     OtherElement,
 }
 
-#[deriving(Eq, Hash)]
+#[deriving(Eq, Hash, Show)]
 pub enum MutabilityCategory {
     McImmutable, // Immutable.
     McDeclared,  // Directly declared as mutable.
@@ -273,12 +273,6 @@ pub trait Typer {
     fn upvar_borrow(&mut self, upvar_id: ty::UpvarId) -> ty::UpvarBorrow;
 }
 
-impl ToStr for MutabilityCategory {
-    fn to_str(&self) -> ~str {
-        format!("{:?}", *self)
-    }
-}
-
 impl MutabilityCategory {
     pub fn from_mutbl(m: ast::Mutability) -> MutabilityCategory {
         match m {