{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"for"}]}
                for field in def.fields() {
            ast::ItemKind::Struct(_, _, ref def) | ast::ItemKind::Union(_, _, ref def) => {
                    self.update_field(self.r.local_def_id(field.id), def_id);