#[cfg_attr(rustfmt, rustfmt::skip::macros(...))] does not work

[tmandry]

Using #[rustfmt::skip::macros(gen)] successfully skips formatting in the following example. So does #[cfg_attr(rustfmt, rustfmt::skip)]. But combining these into #[cfg_attr(rustfmt, rustfmt::skip::macros(gen))] fails.

This also applies for #! attribute declarations. I want to use cfg_attr to avoid "unused attribute" lints on these.

Playground

fn example() {
    gen!(f, "
        trait $trait_name {
            fn $func_name(self, $args_sig);
        }
    ")?;
}

[jhpratt]

#![doc(test(attr(rustfmt::skip::macros(date))))] doesn't work either, presumably for similar reasons.

[topecongiro]

#[cfg_attr(rustfmt, ...)] is deprecated, you should use #[rustfmt::...] instead.

I want to use cfg_attr to avoid "unused attribute" lints on these.

This seems like a compiler or a linter error to me. IIUC, the tool attribute has already been supported, and any attributes starting with rustfmt should trigger warnings or lints (cc rust-lang/rust#44690).