User defined attributes use

[Namespace]

> D is not only about arrays.
It's a big plus. ;)


> [1] Obviously, not a practical short term option for the 
> existing D2 language.
>     That's probably clear from the context, and the question 
> was meant to be
>     rhetorical -- but it could actually be done and would make 
> sense; it's just
>     not a change that would make enough of a difference on its 
> own; the cost
>     would be to high.

Why to high? Too much compiler magic or dmd internal dependences?