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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 a2e69cd377a..c2b32b45ce4 100644
--- a/src/libsyntax/ext/deriving/ty.rs
+++ b/src/libsyntax/ext/deriving/ty.rs
@@ -251,7 +251,7 @@ pub fn get_explicit_self(cx: &ExtCtxt, span: Span, self_ptr: &Option<PtrTy>)
                 span,
                 match *ptr {
                     Send => ast::SelfUniq(ast::MutImmutable),
-                    Managed => ast::SelfBox(ast::MutImmutable),
+                    Managed => ast::SelfBox,
                     Borrowed(ref lt, mutbl) => {
                         let lt = lt.map(|s| cx.lifetime(span, cx.ident_of(s)));
                         ast::SelfRegion(lt, mutbl)