ices/109152.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#109152

fn _y() {
    vec![42].iter().map(drop);
}

fn main() {}

=== stdout ===
=== stderr ===
warning: unused `Map` that must be used
 --> /home/runner/work/glacier/glacier/ices/109152.rs:2:5
  |
2 |     vec![42].iter().map(drop);
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: iterators are lazy and do nothing unless consumed
  = note: `#[warn(unused_must_use)]` on by default

warning: `Iterator::map` call that discard the iterator's values
 --> /home/runner/work/glacier/glacier/ices/109152.rs:2:21
  |
2 |     vec![42].iter().map(drop);
  |                     ^^^^----^
  |                     |   |
  |                     |   this function returns `()`, which is likely not what you wanted
  |                     |   called `Iterator::map` with callable that returns `()`
  |                     after this call to map, the resulting iterator is `impl Iterator<Item = ()>`, which means the only information carried by the iterator is the number of items
  |
  = note: `Iterator::map`, like many of the methods on `Iterator`, gets executed lazily, meaning that its effects won't be visible until it is iterated
  = note: `#[warn(map_unit_fn)]` on by default
help: you might have meant to use `Iterator::for_each`
  |
2 |     vec![42].iter().for_each(drop);
  |                     ~~~~~~~~

warning: 2 warnings emitted

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