Template-Parameterized Variadic isInstaceOf

["Nordlöw" via Digitalmars-d-learn]

On Friday, 7 August 2015 at 11:45:22 UTC, Nordlöw wrote:
> To implement a new trait
>
>     isSortedRange(R, pred)
>
> needed for SortedRange specializations I need a variant of

I've put all my progress into

https://github.com/D-Programming-Language/phobos/pull/3534