[gmueckl]

A Range is something that implements one or more interfaces depending on its properties and guarantees. So in order to name a Range that way you'd first have to create interfaces for all possible guarantees. That doesn't sound practical. It's analogous to C++ containers implementing common concepts without deriving from corresponding interfaces.

See also https://tour.dlang.org/tour/en/basics/ranges

[scott_s]

Yes, this is what C++ concepts are supposed to solve: https://en.cppreference.com/w/cpp/language/constraints