1 error[E0594]: cannot assign to `self.foo`, which is behind a `&` reference
2 --> $DIR/issue-93093.rs:8:9
4 LL | async fn bar(&self) {
5 | ----- help: consider changing this to be a mutable reference: `&mut self`
8 | ^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be written
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0594`.