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error[E0658]: use of an internal attribute
--> $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
= note: the `#[rustc_variance]` attribute is an internal implementation detail that will never be stable
= note: the `#[rustc_variance]` attribute is used for rustc unit tests
error[E0658]: use of an internal attribute
--> $DIR/feature-gate-rustc-attrs-1.rs:7:1
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LL | #[rustc_nonnull_optimization_guaranteed]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
= note: the `#[rustc_nonnull_optimization_guaranteed]` attribute is an internal implementation detail that will never be stable
= note: the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document guaranteed niche optimizations in the standard library
= note: the compiler does not even check whether the type indeed is being non-null-optimized; it is your responsibility to ensure that the attribute is only used on types that are optimized
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0658`.
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