{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"p.psess.gated_spans.gate(sym::default_field_values,"}]}
                            p.psess.gated_spans.gate(sym::default_field_values, sp);
                            let sp = ty.span.shrink_to_hi().to(const_expr.value.span);
                            p.restore_snapshot(snapshot);