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