ices/66693.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#66693

#![feature(const_panic)]

const C: () = {
    panic!(1234);
};

fn main() {}

=== stdout ===
=== stderr ===
error: argument to `panic!()` in a const context must have type `&str`
 --> /home/runner/work/glacier/glacier/ices/66693.rs:4:5
  |
4 |     panic!(1234);
  |     ^^^^^^^^^^^^^
  |
  = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

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