ices/84632.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#84632

macro_rules! n {() => (concat!("", n!()))}

fn main () {
    n!();
}

=== stdout ===
=== stderr ===
error: recursion limit reached while expanding `n!`
 --> /home/runner/work/glacier/glacier/ices/84632.rs:1:36
  |
1 | macro_rules! n {() => (concat!("", n!()))}
  |                                    ^^^^
...
4 |     n!();
  |     ----- in this macro invocation
  |
  = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`84632`)
  = note: this error originates in the macro `n` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

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