3 // ignore-pretty issue #37199
5 fn match_ref(v: Option<isize>) -> isize {
14 fn match_ref_unused(v: Option<isize>) {
21 fn impure(_i: isize) {
24 fn match_imm_reg(v: &Option<isize>) {
26 Some(ref i) => {impure(*i)} // OK because immutable
31 fn match_mut_reg(v: &mut Option<isize>) {
33 Some(ref i) => {impure(*i)} // OK, frozen