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-rw-r--r--src/libsyntax/ext/deriving/ty.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/deriving/ty.rs b/src/libsyntax/ext/deriving/ty.rs
index 83c73e3d85f..a9fdafc8014 100644
--- a/src/libsyntax/ext/deriving/ty.rs
+++ b/src/libsyntax/ext/deriving/ty.rs
@@ -240,7 +240,7 @@ pub fn get_explicit_self(cx: @ExtCtxt, span: Span, self_ptr: &Option<PtrTy>)
     let self_path = cx.expr_self(span);
     match *self_ptr {
         None => {
-            (self_path, respan(span, ast::sty_value))
+            (self_path, respan(span, ast::sty_value(ast::MutImmutable)))
         }
         Some(ref ptr) => {
             let self_ty = respan(