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error[E0277]: `Foo` doesn't implement `Debug`
--> $DIR/method-help-unsatisfied-bound.rs:5:7
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LL | a.unwrap();
| ^^^^^^ `Foo` cannot be formatted using `{:?}`
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= help: the trait `Debug` is not implemented for `Foo`
= note: add `#[derive(Debug)]` to `Foo` or manually `impl Debug for Foo`
note: required by a bound in `Result::<T, E>::unwrap`
--> $SRC_DIR/core/src/result.rs:LL:COL
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LL | E: fmt::Debug,
| ^^^^^^^^^^ required by this bound in `Result::<T, E>::unwrap`
help: consider annotating `Foo` with `#[derive(Debug)]`
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LL | #[derive(Debug)]
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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