ices/83938.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83938

#![crate_type = "lib"]
#![feature(const_generics_defaults)]

type NpOne<T, const N: usize, const NP: usize = {N+1usize}> = [T; NP];

pub fn push<T, const N: usize>(_: [T; N], _: T)
    -> NpOne<T, N>
{
    todo!()
}

=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
 --> /home/runner/work/glacier/glacier/ices/83938.rs:4:50
  |
4 | type NpOne<T, const N: usize, const NP: usize = {N+1usize}> = [T; NP];
  |                                                  ^ cannot perform const operation using `N`
  |
  = help: const parameters may only be used as standalone arguments, i.e. `N`
  = help: use `#![feature(const_generics)]` and `#![feature(const_evaluatable_checked)]` to allow generic const expressions

warning: the feature `const_generics_defaults` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/83938.rs:2:12
  |
2 | #![feature(const_generics_defaults)]
  |            ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

error: aborting due to previous error; 1 warning emitted

==============

[JohnTitor]

Require some additional feature flags.