Crate character_set
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#[test]
fn test_ascii_range() {
let mut set = CharacterSet::default();
set.insert('a'..'z');
set.insert('A'..'Z');
set.insert('0'..'9');
set.optimize();
assert_eq!(set.count(), 62);
assert!(set.contains('a'));
assert!(!set.contains(' '));
}