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-rw-r--r--src/libsyntax_ext/deriving/debug.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/deriving/debug.rs b/src/libsyntax_ext/deriving/debug.rs
index 917c6b1ab89..6e769cd3810 100644
--- a/src/libsyntax_ext/deriving/debug.rs
+++ b/src/libsyntax_ext/deriving/debug.rs
@@ -27,7 +27,7 @@ pub fn expand_deriving_debug(cx: &mut ExtCtxt,
 {
     // &mut ::std::fmt::Formatter
     let fmtr = Ptr(Box::new(Literal(path_std!(cx, core::fmt::Formatter))),
-                   Borrowed(None, ast::MutMutable));
+                   Borrowed(None, ast::Mutability::Mutable));
 
     let trait_def = TraitDef {
         span: span,