Kinds of containers

[Robert burner Schadek via Digitalmars-d]

On Wednesday, 21 October 2015 at 14:20:23 UTC, Andrei 
Alexandrescu wrote:
> Containers will obey subsets of a nomenclature of primitives.

Just to be crystal clear, something like this?

void fun(Container)(ref Container c) if (hasAppend!Container) {
     // append stuff to c
}