I have to agree that the lack of generics is one of the biggest holes in Go. Common container data structures are one example. You can't write, say, a generic

I have to agree that the lack of generics is one of the biggest holes in Go. Common container data structures are one example. You can't write, say, a generic binary search tree in Go, unless you wrap all your data in an interface. While possible, this means you have to downcast all over the place. The built-in map, while useful, is limited in how far it goes. Maybe I'm just spoiled by the STL and the Java collections libraries.