rustfmt fails to format a lambda in a method call with a large tuple pattern

[programmerjake]

https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=a8bacd11957fe7bcbc35ed7f9f667f73
I reduced the failure to:

fn f() {
    v.f(
        (),
        |(cd,to_fetch,from_decode,post_decode_output,from_retire,state_for_debug), mut sim| async {
            todo!();
        },
    );
}

I tested it with both 1.8.0-stable (2025-11-07 ed61e7d7e2) and 1.8.0-nightly (2025-12-08 37aa2135b5)

[ytmimi]

How would you expect this to be formated?

[programmerjake]

How would you expect this to be formated?

maybe like this:

fn f() {
    v.f(
        (),
        |(
            cd,
            to_fetch,
            from_decode,
            post_decode_output,
            from_retire,
            state_for_debug,
        ), mut sim| async {
            todo!();
        },
    );
}