So, pointer implicitly converts to false if pointer is null and to true if pointer is not null. Is it bug or terrible feature? Note that we have `f is null` syntax for these cases.
Not exactly. It is all about "if" condition. AFAIK, D defines that condition `if(X)` get re-written to `if(cast(bool)X)` before semantic pass. So it is kind of implicit explicit conversion :)
