1 error[E0596]: cannot borrow `*self.s` as mutable, as it is behind a `&` reference
2 --> $DIR/issue-38147-3.rs:7:9
5 | ^^^^^^^^^^^^^^^^ cannot borrow as mutable
7 help: consider changing this to be mutable
12 error: aborting due to previous error
14 For more information about this error, try `rustc --explain E0596`.