Rustfmt wrongly alphabatizes raw identifiers in `use` statements

[InsertCreativityHere]

Description

I'm writing a toy compiler, and recently split up the elements of my grammar into their own modules.
Unfortunately, there's overlap between the elements and some Rust keywords, so sometimes I need to use raw identifiers:

use self::r#enum::*;
use self::interface::*;
use self::struct::*;

I would expect these to be sorted alphabetically, not including the r#
But, rustfmt seems to include it when sorting, and changes this to:

use self::interface::*;
use self::r#enum::*;
use self::struct::*;

Note that this doesn't happen with modules:

mod r#enum;
mod interface;
mod struct;

here rustfmt correctly ignores the r# prefix when sorting.

I'm open to fixing this, if someone could point me in the right direction! Since it seems *crosses fingers* like an easy fix.

Environment

rustfmt 1.4.38-nightly (e0944922 2022-05-31) on macOS Monterey

[calebcartwright]

Thanks for reaching out and being willing to work on it!

Fortunately (perhaps), this is one that was actually already reported (see #3791) and fixed in source control a while ago (and #3795).

However, the fix was made on a different branch that hasn't been pulled in yet. The only outstanding issue is that it technically qualifies as a formatting change which we have to gate against, and no one has had the time/motivation to figure out how to apply the gating yet.

Definitely feel free to take a look at the old PR, you may be able to cherry-pick the commit and apply @ytmimi's suggestion from #3795 (comment) to gate the change, and let us know if you have any questions.