I know this is just back-of-envelope, but what's wrong with:alias Nullable(T) if(is(T == class)) = T; bool isNull(T)(T t) if(is(T == class)) { return t is null;}
That's what I intended. (Same for pointers and slices, BTW.)I does however have a slightly different behaviour: In the current implementation, there can be instances for which `isNull` returns false, but whose payloads are nevertheless `null`.
