Null references redux

[Andrei Alexandrescu]

Walter Bright wrote:
> The problem with non-nullable references is what do they default to? 
> Some "nan" object? When you use a "nan" object, what should it do? Throw 
> an exception?

This is the mistake. There would no way to default initialize a non-null 
object. I'm surprised you are still saying this, because we discussed 
how NonNull!T could be implemented by disabling its default constructor.

Andrei