Go's type system with limited polymorphism looks to me like someone took the (horrible) collections from Java 1.2 and applied a fix that solves 85% of the problem. Compared to the 95% solution we get with Java, it's not as refined but also plenty good enough in most cases where concrete code deals with concrete problems (i.e. not framework-level code where you'd curse Java for lacking Scala's types-and-implicit-driven compile time contorsions).