Unboxed closures: function signature of expand* changed

serde2/serde2_macros/src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(plugin_registrar, quote)]
+#![feature(plugin_registrar, quote, unboxed_closures)]
 
 extern crate syntax;
 extern crate rustc;
@@ -62,8 +62,7 @@ fn expand_deriving_serialize<>(cx: &mut ExtCtxt,
                                 sp: Span,
                                 mitem: &MetaItem,
                                 item: &Item,
-                                push: |P<ast::Item>|) //where
-        //F: FnOnce(P<ast::Item>)
+                                mut push: Box<FnMut(P<ast::Item>)>)
 {
     let inline = cx.meta_word(sp, token::InternedString::new("inline"));
     let attrs = vec!(cx.attribute(sp, inline));
@@ -129,7 +128,7 @@ fn expand_deriving_serialize<>(cx: &mut ExtCtxt,
         ]
     };
 
-    trait_def.expand(cx, mitem, item, |item| push(item))
+    trait_def.expand(cx, mitem, item, |item| push.call_mut((item,)))
 }
 
 fn serialize_substructure(cx: &ExtCtxt, span: Span, substr: &Substructure) -> P<Expr> {