1 error[E0599]: no method named `unwrap` found for type `std::result::Result<(), Foo>` in the current scope
2 --> $DIR/method-help-unsatisfied-bound.rs:5:7
5 | ^^^^^^ method not found in `std::result::Result<(), Foo>`
7 = note: the method `unwrap` exists but the following trait bounds were not satisfied:
8 `Foo : std::fmt::Debug`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0599`.