On Tuesday, 26 October 2021 at 01:19:29 UTC, Andrei Alexandrescu wrote: > Versioning Phobos would free us from maintaining backward can we improve this ```d if (isInputRange!(Range1) && isInputRange!(Range2)) ``` to: ```d if isallInputRange(Range1,Range2) ``` ? `C++`'s `concept` is very grace.