struct Katniss;
struct Chiko;
struct Lola;

struct Cat;
struct Dog;

struct Jacob;

macro_rules! relate {
    ($in: ty, $out: ty, $forward: ty, $backward: ty) => {
        todo!();
    };
}

relate!(Jacob, Katniss, Loves, IsLovedBy);


// relate_many!(Cat, (Katniss, Chiko), HasMembers, Species);
// relate_many!(Dog, (Lola,), HasMembers, Species);


// relate!();

// relate_bidirectional!();

// relate_many_bidirectional!();

// relate_many!(Lola, (Katniss, Chiko), );


fn main() {

}


#[rustfmt::skip]
macro_rules! all_the_tuples {
    ($name:ident) => {
        $name!([], T1);
        $name!([T1], T2);
        $name!([T1, T2], T3);
        $name!([T1, T2, T3], T4);
        $name!([T1, T2, T3, T4], T5);
        $name!([T1, T2, T3, T4, T5], T6);
        $name!([T1, T2, T3, T4, T5, T6], T7);
        $name!([T1, T2, T3, T4, T5, T6, T7], T8);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8], T9);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9], T10);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10], T11);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11], T12);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12], T13);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13], T14);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14], T15);
        $name!([T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15], T16);
    };
}

macro_rules! all_the_tuples_no_last_special_case {
    ($name:ident) => {
        $name!(T1);
        $name!(T1, T2);
        $name!(T1, T2, T3);
        $name!(T1, T2, T3, T4);
        $name!(T1, T2, T3, T4, T5);
        $name!(T1, T2, T3, T4, T5, T6);
        $name!(T1, T2, T3, T4, T5, T6, T7);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15);
        $name!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16);
    };
}