Generic classes.

[Autrijus Tang]

S06 made many explicit uses of generics as classes, which I find
difficult to reconcile with the "only roles takes type parameter"
ruling.  For example:

    my Hash of Array of Recipe %book;
    my Hash[returns=>Array[returns=>Recipe]] %book;

And later:

    class LoudArray is Array { ... }

Clearly, here Hash and Array are used as instantiable, generic classes,
instead of mere roles.  Does this need to change, or can we lift the
ban on type-parameterized classes?

Thanks,
/Autrijus/

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