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-rw-r--r--src/libsyntax/ast.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index b6b18f6671d..7fef6da5607 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -354,7 +354,7 @@ pub enum Pat_ {
     PatVec(Vec<@Pat> , Option<@Pat>, Vec<@Pat> )
 }
 
-#[deriving(Clone, Eq, Encodable, Decodable, Hash)]
+#[deriving(Clone, Eq, Encodable, Decodable, Hash, Show)]
 pub enum Mutability {
     MutMutable,
     MutImmutable,