Formatting labelled block expression in match arm causes invalid Rust code

[Samzyre]

This code
https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=6c806c4f3f7db3d30ba75a53393b222f

fn main() {
    match true {
        true => 'a: {
            break 'a
        }
        _ => (),
    }
}

formats into:

fn main() {
    match true {
        true => break 'a,
        _ => (),
    }
}

So the label is no longer valid.

In this simple case, you could just prevent the formatting by adding a semicolon after the break, but a more complex case might not return () from the labelled block (and therefore require additional changes).

Version:
rustfmt 1.5.2-nightly (c18a5e8a 2023-01-25)

EDIT (@ytmimi): Updated the examples so that rustfmt can be run on the code snippet directly.