num_enum 0.7.6

Procedural macros to make inter-operation between primitives and enums easier.
Documentation 
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use num_enum::{FromPrimitive, IntoPrimitive, TryFromPrimitive};

#[derive(Debug, Eq, PartialEq, TryFromPrimitive)]
#[repr(u8)]
enum Number {
    Zero,
    NonZero(u8),
}

#[derive(Debug, Eq, PartialEq, FromPrimitive)]
#[repr(u8)]
enum Colour {
    Red { intensity: u8 },
}

#[derive(Debug, Eq, PartialEq, IntoPrimitive)]
#[repr(u8)]
enum Meaningless {
    Beep(),
}

fn main() {}