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error[E0277]: `Dummy` doesn't implement `Debug`
--> $DIR/issue-107649.rs:105:5
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105 | dbg!(lib::Dummy);
| ^^^^^^^^^^^^^^^^ `Dummy` cannot be formatted using `{:?}`
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= help: the trait `Debug` is not implemented for `Dummy`
= note: add `#[derive(Debug)]` to `Dummy` or manually `impl Debug for Dummy`
= note: this error originates in the macro `$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 `Dummy` with `#[derive(Debug)]`
--> $DIR/auxiliary/dummy_lib.rs:2:1
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2 | #[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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