Raw identifier ordering is different in mod and use

[kazatsuyu]

I made the following file:

// example.rs
mod d;
mod f;
mod s;
mod r#if;
mod r#else;

use d::*;
use f::*;
use s::*;
use r#if::*;
use r#else::*;

And I ran the following command:

rustfmt --unstable-features --skip-children --emit stdout example.rs

I got the following output.

// example.rs
mod d;
mod r#else;
mod f;
mod r#if;
mod s;

use d::*;
use f::*;
use r#else::*;
use r#if::*;
use s::*;

rustfmt version: 1.4.15-nightly (aedff61 2020-05-19)

[ayazhafiz]

skip-children and unstable-features were removed in #4006, looks like this is fixed on master. I'll add a test case for regression