Expected `fn` not `fn blah`

[glmdgrielson]

impl Trait for Struct {
    cfg_if! {
        if #[cfg(feature = "blah")] {
            fn blah(&self) {
                unimplemented!();
            }
        } else {
            fn blah(&self) {
                unimplemented!();
            }
        }
    }
}

This generates the error:

expected one of `const`, `crate`, `default`, `extern`, `fn`, `pub`, `type`, or `unsafe`, found `fn blah(?) { unimplemented!(); }`

expected one of 8 possible tokens here

What gives? Putting the attribute myself works but the macro has a weird failure.

[alexcrichton]

Thanks for the report! Currently though this crate only works with "item" AST nodes rather than "impl items" lie functions in an impl

[alexcrichton]

As of https://github.com/alexcrichton/cfg-if/pull/28 this is now supported