error[E0658]: const generics are unstable
  --> $DIR/const-param-in-trait-ungated.rs:1:19
   |
LL | trait Trait<const T: ()> {}
   |                   ^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.