ices/100103.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#100103

#![feature(let_else)]
fn main() {
    let Some(x) = Some(()) else {
        match Err(()) {
            Err(()) => return (),
            Ok(val) => val,
        }
    };
}

=== stdout ===
=== stderr ===
warning: unused variable: `x`
 --> /home/runner/work/glacier/glacier/ices/100103.rs:3:14
  |
3 |     let Some(x) = Some(()) else {
  |              ^ help: if this is intentional, prefix it with an underscore: `_x`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: 1 warning emitted

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