I dun a DIP, possibly the best DIP ever

[Walter Bright]

On 4/23/2020 11:00 PM, Manu wrote:
> I guess this is the key case you need to solve for:
> 
>    template T(Args...) {}
>    T!(Tup)     -> T!(0, 1, 2)
>    T!(Tup)...  -> T!0, T!1, T!2
> 
> And the parallel expansion disambiguation is also critical:
>    T!(Tup, Tup2...)...  -> T!(0, 3, 4, 5), T!(1, 3, 4, 5), T!(2, 3, 4, 5)
> 
> If you can solve those, the rest will probably follow.

Fair enough. Though there needs to be a rationale as to why those two particuler 
cases are needed and critical.