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error[E0277]: `NotDebug` doesn't implement `Debug`
--> $DIR/dbg-macro-requires-debug.rs:6:23
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LL | let _: NotDebug = dbg!(NotDebug);
| ^^^^^^^^^^^^^^ `NotDebug` cannot be formatted using `{:?}`
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= help: the trait `Debug` is not implemented for `NotDebug`
= note: add `#[derive(Debug)]` to `NotDebug` or manually `impl Debug for NotDebug`
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `NotDebug` with `#[derive(Debug)]`
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LL + #[derive(Debug)]
LL | struct NotDebug;
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error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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