ices/84957.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#84957

trait SerialPort {}

struct Example {
    member0: &'static [u8],
    member2: fn(&Box<dyn SerialPort>),
}
fn function1(_: &Box<dyn SerialPort>) {}

const EXAMPLE_MAP: &[Example] = &[
    Example {
        member0: "0".as_bytes(),
        member2: function1,
    },
    Example {
        member0: "0".as_bytes(),
        member2: function1,
    },
];

fn main() {
    let port = todo!();

    for example_member in EXAMPLE_MAP {
        (example_member.member2)(&port);
    }
}

=== stdout ===
=== stderr ===
warning: unreachable expression
  --> /home/runner/work/glacier/glacier/ices/84957.rs:23:5
   |
21 |       let port = todo!();
   |                  ------- any code following this expression is unreachable
22 | 
23 | /     for example_member in EXAMPLE_MAP {
24 | |         (example_member.member2)(&port);
25 | |     }
   | |_____^ unreachable expression
   |
   = note: `#[warn(unreachable_code)]` on by default

warning: unused variable: `port`
  --> /home/runner/work/glacier/glacier/ices/84957.rs:21:9
   |
21 |     let port = todo!();
   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_port`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: field is never read: `member0`
 --> /home/runner/work/glacier/glacier/ices/84957.rs:4:5
  |
4 |     member0: &'static [u8],
  |     ^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: 3 warnings emitted

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

[JohnTitor]

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