{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":".filter(|(_,"}]}
            .filter(|(_, ident)| !used_fields.contains_key(ident))
            .map(|field| (field, field.ident(self.tcx).normalize_to_macros_2_0()))
            .collect::<Vec<_>>();