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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 72d5323a872..e1e220f49c9 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -667,7 +667,7 @@ pub enum PatKind {
     Mac(Mac),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Mutability {
     Mutable,
     Immutable,