{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"self.tree.big_data.insert(ast_id.upcast(),"}]}
        self.tree.big_data.insert(ast_id.upcast(), BigModItem::ExternCrate(res));
        let res = ExternCrate { name, alias, visibility };
        Some(ast_id)