Developing a plan for D2.0: Getting everything on the table

[bearophile]

Andrei Alexandrescu:
> It could if there was a way to disable the default constructor. Walter 
> seemed to be interested in the idea.

(I'm always a little suspicious of library solutions, because they sometimes smell of over-generalization, but sometimes they are a better solution.)
It's interesting, can you please quickly show me how disabling the default constructor may allow you to implement this solution?

Bye,
bearophile