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1f6a9aacee
Tweak `&mut self` suggestion span
```
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) {
| +++
```
Note the suggestion to add `mut` instead of replacing the entire `&self` with `&mut self`.