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error[E0658]: use of an internal attribute
--> $DIR/feature-gate-on-unimplemented.rs:3:1
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LL | #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}`"]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
= note: the `#[rustc_on_unimplemented]` attribute is an internal implementation detail that will never be stable
= note: see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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