auto_serialize should use explicit refs (fixes #4044)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libsyntax/ext/auto_serialize.rs b/src/libsyntax/ext/auto_serialize.rs
index f9fece0b5cb..42f120484f0 100644
--- a/src/libsyntax/ext/auto_serialize.rs
+++ b/src/libsyntax/ext/auto_serialize.rs
@@ -265,7 +265,7 @@ priv impl ext_ctxt {
         let path = @{span: span, global: false, idents: ~[nm],
                      rp: None, types: ~[]};
         @{id: self.next_id(),
-          node: ast::pat_ident(ast::bind_by_implicit_ref,
+          node: ast::pat_ident(ast::bind_by_ref(ast::m_imm),
                                path,
                                None),
           span: span}
@@ -887,7 +887,7 @@ fn ser_variant(
 
     let pat_node = if pats.is_empty() {
         ast::pat_ident(
-            ast::bind_by_implicit_ref,
+            ast::bind_by_ref(ast::m_imm),
             cx.path(span, ~[v_name]),
             None
         )