| error[E0658]: the `#[rustc_variance]` attribute is just used for rustc unit tests and will never be stable |
| --> $DIR/feature-gate-rustc-attrs-1.rs:5:1 |
| | |
| LL | #[rustc_variance] |
| | ^^^^^^^^^^^^^^^^^ |
| | |
| = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable |
| |
| error[E0658]: the `#[rustc_error]` attribute is just used for rustc unit tests and will never be stable |
| --> $DIR/feature-gate-rustc-attrs-1.rs:6:1 |
| | |
| LL | #[rustc_error] |
| | ^^^^^^^^^^^^^^ |
| | |
| = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable |
| |
| error[E0658]: the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to enable niche optimizations in libcore and will never be stable |
| --> $DIR/feature-gate-rustc-attrs-1.rs:7:1 |
| | |
| LL | #[rustc_nonnull_optimization_guaranteed] |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| | |
| = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable |
| |
| error: aborting due to 3 previous errors |
| |
| For more information about this error, try `rustc --explain E0658`. |