`imports_granularity=Item` removes `#[cfg()]` attribute from imports

[narpfel]

If I format this file

#[cfg(feature = "foo")]
use std::collections::{
    HashMap,
    HashSet,
};

fn main() {
    println!("Hello, world!");
}

with rustfmt --config imports_granularity=Item, rustfmt removes the cfg attribute:

$ rustfmt --config imports_granularity=Item main.rs

Output:

use std::collections::HashMap;
use std::collections::HashSet;

fn main() {
    println!("Hello, world!");
}

This only happens if there is more than one import in the use statement, i. e. formatting

#[cfg(feature = "foo")]
use std::collections::{
    HashMap,
};

correctly retains the attribute.

rustfmt was installed via rustup, current nightly:

$ rustfmt --version
rustfmt 1.4.37-nightly (c102653 2021-10-15)

[calebcartwright]

Thanks for the report!

[calebcartwright]

Cross linking #4991