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error[E0277]: `Error` doesn't implement `Debug`
--> $DIR/derives-span-Debug-struct.rs:8:5
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LL | #[derive(Debug)]
| ----- in this derive macro expansion
LL | struct Struct {
LL | x: Error
| ^^^^^^^^ `Error` cannot be formatted using `{:?}`
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= help: the trait `Debug` is not implemented for `Error`
= note: add `#[derive(Debug)]` to `Error` or manually `impl Debug for Error`
= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Error` with `#[derive(Debug)]`
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LL + #[derive(Debug)]
LL | struct Error;
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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