| error[E0658]: the `#[rustc_on_unimplemented]` attribute is an experimental feature (see issue #29628) | |
| --> $DIR/feature-gate-on-unimplemented.rs:14:1 | |
| | | |
| LL | #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}`"] | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| | | |
| = help: add #![feature(on_unimplemented)] to the crate attributes to enable | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0658`. |