Bools and explicitness [was Re: PyWart: The problem with "print"]

[Serhiy Storchaka]

06.06.13 12:45, Chris Angelico написав(ла):
> For the "accept any object that has a next() method" sorts of rules, I
> don't know of any really viable system that does that usefully. The
> concept of implementing interfaces in Java comes close, but the class
> author has to declare that it's implementing some named interface. In
> theory there could be something that deduces the validity from the
> given structure, but I'm not aware of any language that does this.

Go?