ices/109129.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#109129

extern crate proc_macro;

trait Project {
    type Assoc;
}

#[proc_macro]
fn uwu() -> <() as Project>::Assoc {}

=== stdout ===
=== stderr ===
error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
 --> /home/runner/work/glacier/glacier/ices/109129.rs:7:1
  |
7 | #[proc_macro]
  | ^^^^^^^^^^^^^

warning: unused macro definition: `uwu`
 --> /home/runner/work/glacier/glacier/ices/109129.rs:8:4
  |
8 | fn uwu() -> <() as Project>::Assoc {}
  |    ^^^
  |
  = note: `#[warn(unused_macros)]` on by default

error[E0601]: `main` function not found in crate `109129`
 --> /home/runner/work/glacier/glacier/ices/109129.rs:8:38
  |
8 | fn uwu() -> <() as Project>::Assoc {}
  |                                      ^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/109129.rs`

error[E0277]: the trait bound `(): Project` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/109129.rs:8:13
  |
8 | fn uwu() -> <() as Project>::Assoc {}
  |             ^^^^^^^^^^^^^^^^^^^^^^ the trait `Project` is not implemented for `()`

error: aborting due to 3 previous errors; 1 warning emitted

Some errors have detailed explanations: E0277, E0601.
For more information about an error, try `rustc --explain E0277`.
==============