Module declared inside macro is not checked

[mcheshkov]

When I declare modules like this

#[cfg(unix)]
pub mod stub_hal;

rustfmt will check module, irrespective of condition.

However, when I declare them using cfg-if crate rustfmt doesn't check module.

cfg_if! {
    if #[cfg(unix)] {
        pub mod stub_hal;
    }
}

Is is designed behavior? Or is macro parsing not implemented for now?

That's rustfmt 1.0.1-nightly (be13559 2018-12-10)

[topecongiro]

Parsing macro is possible only when the macro has valid syntax (e.g. println!). Most macros, including cfg_if!, contains invalid syntax in it (e.g. if #[cfg(unix)]), so rustfmt just ignores it.

[gnzlbg]

FYI this means that we can't use rustfmt effectively in rust-lang-nursery/{stdsimd, packed_simd} nor in rust-lang/libc. This appears to be hard to solve.