ices/104172.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#104172

#![allow(dead_code)]

const N: usize = {
    struct U;
    ! let y = 42;
    3
};

struct S {
    x: [(); N]
}

fn main() {}

=== stdout ===
=== stderr ===
error: expected expression, found `let` statement
 --> /home/runner/work/glacier/glacier/ices/104172.rs:5:7
  |
5 |     ! let y = 42;
  |       ^^^
  |
  = note: only supported directly in conditions of `if` and `while` expressions

error: aborting due to previous error

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