error[E0308]: mismatched types --> $DIR/mut-pattern-mismatched.rs:6:10 | LL | let &_ | ^^ types differ in mutability | = note: expected type `&mut {integer}` found type `&_` error[E0308]: mismatched types --> $DIR/mut-pattern-mismatched.rs:15:9 | LL | let &mut _ | ^^^^^^ types differ in mutability | = note: expected type `&{integer}` found type `&mut _` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.