Now compatible with rustc 1.13.0-nightly (32571c05c 2016-09-17)
@@ -108,6 +108,7 @@ pub fn expand_deriving_from_primitive(cx: &mut ExtCtxt,
}
),
associated_types: Vec::new(),
+ supports_unions: false,
};
trait_def.expand(cx, mitem, &item, push)