9 let Wrap(x) = &Wrap(3);
12 let Wrap(x) = &mut Wrap(3);
15 if let Some(x) = &Some(3) {
21 if let Some(x) = &mut Some(3) {
27 if let Some(x) = &mut Some(3) {
33 while let Some(x) = &Some(3) {
37 while let Some(x) = &mut Some(3) {
41 while let Some(x) = &mut Some(3) {