error[E0658]: the `#[rustc_const_unstable]` attribute is an internal feature | |
--> $DIR/feature-gate-rustc_const_unstable.rs:18:1 | |
| | |
LL | #[rustc_const_unstable(feature="fzzzzzt")] //~ERROR internal feature | |
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| | |
= help: add #![feature(rustc_const_unstable)] to the crate attributes to enable | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0658`. |