Emulate C's (polymorphic) NULL type

[Anonymouse via Digitalmars-d-learn]

On Monday, 6 June 2016 at 12:09:33 UTC, ParticlePeter wrote:
> I don't see the connection here, you introduced two symbols 
> with two different types. I want one symbol which can pose as 
> two different (constant) types.

Ah, my apologies, I misunderstood the question.