如何引入带有宏的Rust枚举变量？

我想使用Rust宏在“定制”变量的旁边引入枚举变量。作为一个简单的例子：

macro_rules! make_beta {
    () => {Beta}
}

enum Greek {
    Alpha,
    make_beta! ()
}

我的真正目标是要有一个家庭：

macro_rules! make_variants {
    ($($N:literal)+) => {
        $(
            Array$N([u8; $N]),
        )+
    }
}

enum Stuff {
    Empty,
    Something,
    make_variants! { 1 2 3 4 5 6 7 8 }
}

which has Array1 through Array8 in addition to "bespoke" variants. Unfortunately neither of these compiles: it complains about the exclamation mark example.

如何使用宏介绍枚举变量？