Macro bevy_ecs::smaller_tuples_too

macro_rules! smaller_tuples_too {
    ($m: ident, $ty: ident) => { ... };
    ($m: ident, $ty: ident, $($tt: ident),*) => { ... };
}

Imagine macro parameters, but more like those Russian dolls.

Calls m!(A, B, C), m!(A, B), m!(B), and m!() for i.e. (m, A, B, C) where m is any macro, for any number of parameters.