File: feature-gate-on-unimplemented.stderr

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error[E0658]: this is an internal attribute that will never be stable
  --> $DIR/feature-gate-on-unimplemented.rs:3:1
   |
LL | #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}`"]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.