enum_primitive::enum_from_primitive_impl!

macro_rules! enum_from_primitive_impl {
    ($name:ident, $( $variant:ident ),*) => {
        impl ::num::FromPrimitive for $name {
            enum_from_primitive_impl_ty! { from_i64, i64, $name, $( $variant ),* }
            enum_from_primitive_impl_ty! { from_u64, u64, $name, $( $variant ),* }
        }
    }
}

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Helper macro for internal use by enum_from_primitive!.