ices/109300.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#109300

#![feature(generic_const_exprs)]
trait B {
    type U<T: A>;
}

fn f<T: B<U<1i32> = ()>>() {}

fn main() {}

=== stdout ===
=== stderr ===
error[E0405]: cannot find trait `A` in this scope
 --> /home/runner/work/glacier/glacier/ices/109300.rs:3:15
  |
3 |     type U<T: A>;
  |               ^ not found in this scope

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/109300.rs:1:12
  |
1 | #![feature(generic_const_exprs)]
  |            ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
  = note: `#[warn(incomplete_features)]` on by default

error[E0747]: constant provided when a type was expected
 --> /home/runner/work/glacier/glacier/ices/109300.rs:6:13
  |
6 | fn f<T: B<U<1i32> = ()>>() {}
  |             ^^^^

error: aborting due to 2 previous errors; 1 warning emitted

Some errors have detailed explanations: E0405, E0747.
For more information about an error, try `rustc --explain E0405`.
==============