1 error[E0303]: pattern bindings are not allowed after an `@`
2 --> $DIR/pattern-bindings-after-at.rs:18:31
4 LL | ref mut z @ &mut Some(ref a) => {
5 | ^^^^^ not allowed after `@`
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0303`.