Not sure what you mean by capabilities, even after looking back at the article. I like how Go's interfaces are sort of like Haskell's typeclasses, and I assume

Not sure what you mean by capabilities, even after looking back at the article. I like how Go's interfaces are sort of like Haskell's typeclasses, and I assume you meant something along those lines, but without parametric polymorphism you're still stuck with one of these three. I can see myself making that statement, and obviously "can't imagine" is hyperbole, since I've written a lot of C, but I can't imagine taking seriously a new language that doesn't let me reuse data structures. I'm not sure what you mean by fixated on modeling with types.. I don't care about inheritance hierarchies, I just want a priority queue (and a multimap and a graph and a blocking queue oh wait that's yet another built-in special case) that doesn't force me to downcast like in Java 1.4.