enum-tools 0.5.5

Automatically derive functions and trait implementations for enums
Documentation 
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include!("macro/macro.rs");

setup!(#[enum_tools(TryFrom)];);

#[test]
fn try_from_trait_gapless() {
    use eg::EG;
    assert_eq!(EG::try_from(0), Ok(EG::A));
    assert_eq!(EG::try_from(1), Ok(EG::B));
    assert_eq!(EG::try_from(2), Ok(EG::C));
    assert_eq!(EG::try_from(3), Ok(EG::D));
    assert_eq!(
        (i8::MIN..=i8::MAX)
            .filter_map(|v| TryFrom::try_from(v).ok())
            .collect::<Vec<EG>>(),
        vec![EG::A, EG::B, EG::C, EG::D]
    );
}

#[test]
fn try_from_trait_with_holes() {
    use eh::EH;
    assert_eq!(EH::try_from(0), Ok(EH::A));
    assert_eq!(EH::try_from(9), Ok(EH::B));
    assert_eq!(EH::try_from(2), Ok(EH::C));
    assert_eq!(EH::try_from(1), Ok(EH::D));
    assert_eq!(
        (i8::MIN..=i8::MAX)
            .filter_map(|v| TryFrom::try_from(v).ok())
            .collect::<Vec<EH>>(),
        vec![EH::A, EH::D, EH::C, EH::B]
    );
}