match value {
            OpCode::NoOp => 0,
        }

        // safe due to repr(u8)
        value as u8

    }
    #[test]
    fn consistency() {
        for i in 0..=255u8 {
            let produced: Result<OpCode, _> = i.try_into();
            if let Ok(op) = produced {
                let roundtrip_i: u8 = op.into();
                assert!(i == roundtrip_i);
            }
        }