rustfmt requires two runs to converge on contrived input

fn test(input: Foo) {
    match input {
        Foo::Bar => {
            ;
            Baz {
                field: 0
            }
        }
    }
}

Given this admittedly contrived input, running rustfmt once removes the semicolon. Running it a second time removes the braces for the match body.

I don't know if rustfmt has a rule about being idempotent, but it certainly would surprise me to regularly encounter situations where I have to manually run it to a fixed point.

Tested in the playground, 1.8.0-stable (2024-11-26 90b35a6239).

Start by reproducing the supplied Rust input with rustfmt and comparing the first and second outputs. Trace the formatter handling for match arms, semicolon removal, and brace removal; done means formatting reaches the same result in one run while preserving valid Rust formatting behavior.