src/tools/rustfmt/tests/source/spaces-around-ranges.rs

// rustfmt-spaces_around_ranges: true

fn bar(v: &[u8]) {}

fn foo() {
    let a = vec![0; 20];
    for j in 0..=20 {
        for i in 0..3 {
            bar(a[i..j]);
            bar(a[i..]);
            bar(a[..j]);
            bar(a[..=(j + 1)]);
        }
    }
}