1 error[E0599]: the method `unwrap` exists for enum `Result<(), Foo>`, but its trait bounds were not satisfied
2 --> $DIR/method-help-unsatisfied-bound.rs:5:7
5 | ----------- doesn't satisfy `Foo: Debug`
8 | ^^^^^^ method cannot be called on `Result<(), Foo>` due to unsatisfied trait bounds
10 = note: the following trait bounds were not satisfied:
12 help: consider annotating `Foo` with `#[derive(Debug)]`
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0599`.