src/test/ui/const-generics/const-param-in-trait-ungated.stderr

error[E0658]: const generics are unstable
  --> $DIR/const-param-in-trait-ungated.rs:1:19
   |
LL | trait Trait<const T: ()> {}
   |                   ^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/44580
   = help: add `#![feature(const_generics)]` to the crate attributes to enable

error: aborting due to previous error

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