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