The fact that Rob Pike wrote a usable language that is not OOP in the sense that the commenter thinks of OOP, in which you have composition without inheritance is direct evidence against the commenter's point of view that to do composition you need to be doing OOP.
The fact that Rob Pike wrote a usable language that is not OOP in the sense that the commenter thinks of OOP, in which you have composition without inheritance is direct evidence against the commenter's point of view that to do composition you need to be doing OOP.