ices/68091.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#68091

macro_rules! x {
    ($($c:tt)*) => {
        $($c)ö* {}
    };
}

fn main() {
    x!(if);
}

=== stdout ===
=== stderr ===
error: missing condition for `if` expression
 --> /home/runner/work/glacier/glacier/ices/68091.rs:3:14
  |
3 |         $($c)ö* {}
  |              ^ expected if condition here

error[E0308]: mismatched types
 --> /home/runner/work/glacier/glacier/ices/68091.rs:3:17
  |
3 |         $($c)ö* {}
  |                 ^^ expected `bool`, found `()`
...
8 |     x!(if);
  |     ------- in this macro invocation

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
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