| error[E0596]: cannot borrow `*self.s` as mutable, as it is behind a `&` reference | |
| --> $DIR/issue-38147-1.rs:17:9 | |
| | | |
| LL | self.s.push('x'); | |
| | ^^^^^^ `self` is a `&` reference, so the data it refers to cannot be borrowed as mutable | |
| | | |
| help: consider changing this to be a mutable reference | |
| | | |
| LL | fn f(&mut self) { | |
| | +++ | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0596`. |