ices/83494.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83494

impl T {
    #[rustc_args_required_const(1)]
    fn is_null() {}
}

=== stdout ===
=== stderr ===
error: attributes starting with `rustc` are reserved for use by the `rustc` compiler
 --> /home/runner/work/glacier/glacier/ices/83494.rs:2:7
  |
2 |     #[rustc_args_required_const(1)]
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^

error: cannot find attribute `rustc_args_required_const` in this scope
 --> /home/runner/work/glacier/glacier/ices/83494.rs:2:7
  |
2 |     #[rustc_args_required_const(1)]
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0412]: cannot find type `T` in this scope
 --> /home/runner/work/glacier/glacier/ices/83494.rs:1:6
  |
1 | impl T {
  |      ^ not found in this scope

error[E0601]: `main` function not found in crate `83494`
 --> /home/runner/work/glacier/glacier/ices/83494.rs:1:1
  |
1 | / impl T {
2 | |     #[rustc_args_required_const(1)]
3 | |     fn is_null() {}
4 | | }
  | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/83494.rs`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0412, E0601.
For more information about an error, try `rustc --explain E0412`.
==============