NotNull pointers

[dsimcha]

== Quote from Walter Bright (newshound2 at digitalmars.com)'s article
> On 8/29/2011 1:32 PM, dsimcha wrote:
> > How does it work for member variables of classes and structs?  E.g.:
> >
> > // Is this legal or not?
> > struct Foo
> > {
> >      NotNull!(int*) notNull;
> >
> >      this(int* ptr)
> >      {
> >          notNull = ptr;
> >      }
> > }
> Try it and see! (It works as you'd expect.)

http://d.puremagic.com/test-results/

DMD doesn't even build right now.