ices/75158.rs: fixed with errors (#546)

=== stdout ===
=== stderr ===
warning: unused variable: `x`
 --> /home/runner/work/glacier/glacier/ices/75158.rs:8:9
  |
8 |     let x = f();
  |         ^ help: if this is intentional, prefix it with an underscore: `_x`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: field is never read: `x`
 --> /home/runner/work/glacier/glacier/ices/75158.rs:1:15
  |
1 | struct S<T> { x: [T; !0] }
  |               ^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

error: the type `[u8; 18446744073709551615]` is too big for the current architecture

error: aborting due to previous error; 2 warnings emitted

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

Co-authored-by: rustbot <[email protected]>

Author: github-actions[bot]