rune 0.14.1

The Rune Language, an embeddable dynamic programming language for Rust.
Documentation 
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#[test]
fn operator_is() {
    struct Timeout;

    let timeout = Timeout;

    assert_eq!(timeout is Timeout, true);
    assert_eq!(timeout is not Timeout, false);
    assert_eq!(!(timeout is Timeout), false);
    assert_eq!(!(timeout is not Timeout), true);
}

#[test]
fn tupel_is() {
    let tuple = (1, 2, 3);

    assert_eq!(tuple is Tuple, true);
    assert_eq!(tuple is not Tuple, false);
    assert_eq!(!(tuple is Tuple), false);
    assert_eq!(!(tuple is not Tuple), true);
}

#[test]
fn test_variant_typing() {
    enum Custom {
        A,
        B(a),
    }

    let out = Err(0) is Result;
    assert_eq!(out, true);

    let out = Ok(0) is Result;
    assert_eq!(out, true);

    let out = Some(0) is Option;
    assert_eq!(out, true);

    let out = None is Option;
    assert_eq!(out, true);

    let out = Custom::A is Custom;
    assert_eq!(out, true);

    let out = Custom::B(42) is Custom;
    assert_eq!(out, true);

    let out = Custom::A is Option;
    assert_eq!(out, false);

    let out = Custom::A is not Option;
    assert_eq!(out, true);
}