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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:3:1
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LL | #[rustc_variance]
| ^^^^^^^^^^^^^^^^^
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= 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:4:1
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LL | #[rustc_error]
| ^^^^^^^^^^^^^^
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= 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 libstd and will never be stable
--> $DIR/feature-gate-rustc-attrs-1.rs:5:1
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LL | #[rustc_nonnull_optimization_guaranteed]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= 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`.
|
