expand 0.3.0

Macro to expand byte string and string literals
Documentation 
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use expand::expand;

#[test]
fn hello_world() {
    assert_eq!(
        &expand!([@b"Hello,", b' ', @b"world", b'!']),
        b"Hello, world!",
    );
}

#[test]
fn hello_world_string() {
    assert_eq!(
        expand!(vec![@"Hello,", ' ', @"world", '!']),
        "Hello, world!".chars().collect::<Vec<char>>(),
    );
}

#[test]
fn pattern_matching() {
    if let expand!([@b"patt", x, y, b'n', ..]) = b"pattern matching" {
        assert_eq!(x, &b'e');
        assert_eq!(y, &b'r');
    } else {
        panic!("pattern matching failed");
    }
}

#[test]
fn pattern_matching2() {
    if let expand!([@b"msg = \"", xs @ .., b'"']) = br#"msg = "Hello, world!""# {
        assert_eq!(xs, b"Hello, world!");
    } else {
        panic!("pattern matching failed");
    }
}