For-each on Iterator?

[jstuyts]

There is already an extension function to iterate over the elements of an iterator using forEach.

@tango24

Would it be possible (from a language design perspective) to additionally allow looping over objects that are iterators (i.e. have member of extension functions next() and hasNext())?

Assuming you want to use objects that do not implement Iterator but do have the methods of Iterator, as an iterator, this has been discussed before. The Kotlin team decided not to implement it: "Extension types" for Kotlin. Also see Implicit interfaces as in Go and Implicit interfaces.