1 error[E0658]: naming constants with `_` is unstable (see issue #54912)
2 --> $DIR/feature-gate-underscore_const_names.rs:17:1
4 LL | / const _ : () = {
5 LL | | use std::marker::PhantomData;
6 LL | | struct ImplementsTrait<T: Trt>(PhantomData<T>);
7 LL | | let _ = ImplementsTrait::<Str>(PhantomData);
12 = help: add #![feature(underscore_const_names)] to the crate attributes to enable
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0658`.