1 error[E0594]: cannot assign to `self.0`, which is behind a `&` reference
2 --> $DIR/issue-68049-1.rs:7:9
5 | ^^^^^^^^^^^ `self` 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`.