error[E0770]: the type of const parameters must not depend on other generic parameters
  --> $DIR/const-param-type-depends-on-type-param-ungated.rs:6:22
   |
LL | struct B<T, const N: T>(PhantomData<[T; N]>);
   |                      ^ the type must not depend on the parameter `T`

error[E0658]: const generics are unstable
  --> $DIR/const-param-type-depends-on-type-param-ungated.rs:6:19
   |
LL | struct B<T, const N: T>(PhantomData<[T; N]>);
   |                   ^
   |
   = 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 2 previous errors

Some errors have detailed explanations: E0658, E0770.
For more information about an error, try `rustc --explain E0658`.