This is really, still missing the point. “adding methods” is trivial. The real complexity is when you add method M to collection C and expect that class A whic

This is really, still missing the point. “adding methods” is trivial. The real complexity is when you add method M to collection C and expect that class A which does not have any relationship with C also gets the method. It has been shown that it is possible in Scala, without all the unnecessary complexity shown in the authors post. Still, I fail to see any statically typed language even coming close to what is requested from Scala.