roaring 0.8.0

http://roaringbitmap.org: A better compressed bitset - pure Rust implementation
Documentation 
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extern crate roaring;
use roaring::RoaringTreemap;

#[test]
fn array() {
    let mut bitmap1 = (0..2000).collect::<RoaringTreemap>();
    let bitmap2 = (1000..3000).collect::<RoaringTreemap>();
    let bitmap3 = (0..1000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn no_difference() {
    let mut bitmap1 = (1..3).collect::<RoaringTreemap>();
    let bitmap2 = (1..3).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, RoaringTreemap::new());
}

#[test]
fn array_and_bitmap() {
    let mut bitmap1 = (0..2000).collect::<RoaringTreemap>();
    let bitmap2 = (1000..8000).collect::<RoaringTreemap>();
    let bitmap3 = (0..1000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn bitmap_to_bitmap() {
    let mut bitmap1 = (0..12000).collect::<RoaringTreemap>();
    let bitmap2 = (6000..18000).collect::<RoaringTreemap>();
    let bitmap3 = (0..6000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn bitmap_to_array() {
    let mut bitmap1 = (0..6000).collect::<RoaringTreemap>();
    let bitmap2 = (3000..9000).collect::<RoaringTreemap>();
    let bitmap3 = (0..3000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn bitmap_and_array_to_bitmap() {
    let mut bitmap1 = (0..12000).collect::<RoaringTreemap>();
    let bitmap2 = (9000..12000).collect::<RoaringTreemap>();
    let bitmap3 = (0..9000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn bitmap_and_array_to_array() {
    let mut bitmap1 = (0..6000).collect::<RoaringTreemap>();
    let bitmap2 = (3000..6000).collect::<RoaringTreemap>();
    let bitmap3 = (0..3000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn arrays() {
    let mut bitmap1 = ((0..2000).chain(1_000_000..1_002_000).chain(2_000_000..2_001_000))
        .collect::<RoaringTreemap>();
    let bitmap2 = ((1000..3000).chain(1_001_000..1_003_000).chain(2_000_000..2_001_000))
        .collect::<RoaringTreemap>();
    let bitmap3 = ((0..1000).chain(1_000_000..1_001_000)).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn arrays_removing_one_whole_container() {
    let mut bitmap1 = ((0..2000).chain(1_000_000..1_002_000).chain(2_000_000..2_001_000))
        .collect::<RoaringTreemap>();
    let bitmap2 = ((0..3000).chain(1_001_000..1_003_000).chain(2_000_000..2_001_000))
        .collect::<RoaringTreemap>();
    let bitmap3 = (1_000_000..1_001_000).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}

#[test]
fn bitmaps() {
    let mut bitmap1 = ((0..6000).chain(1_000_000..1_012_000).chain(2_000_000..2_010_000))
        .collect::<RoaringTreemap>();
    let bitmap2 = ((3000..9000).chain(1_006_000..1_018_000).chain(2_000_000..2_010_000))
        .collect::<RoaringTreemap>();
    let bitmap3 = ((0..3000).chain(1_000_000..1_006_000)).collect::<RoaringTreemap>();

    bitmap1 -= bitmap2;

    assert_eq!(bitmap1, bitmap3);
}