Custom attributes (again)

[Ary Manzana]

On 4/6/12 3:54 PM, Walter Bright wrote:
> On 4/6/2012 12:49 AM, Alex Rønne Petersen wrote:
>> What about type declarations? I think those ought to be supported too.
>> E.g. it
>> makes sense to mark an entire type as @attr(serializable) (or the
>> inverse).
>
>
> That would make it a "type constructor", not a storage class, which we
> talked about earlier in the thread. I refer you to that discussion.

What's the difference between "type constructor" and "storage class" 
beside the name?