1 error[E0594]: cannot assign to `*x`, which is behind a `&` reference
2 --> $DIR/let-else-binding-immutable.rs:9:5
5 | ^^^^^^^ `x` is a `&` reference, so the data it refers to cannot be written
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0594`.