Adding the ?. operator to D

[FeepingCreature]

On Wednesday, 16 September 2020 at 19:01:28 UTC, Jacob Carlborg 
wrote:
>
> I would like that. It should work for an Optional/Nullable type 
> as well. It's a good idea to add an `??` operator at the same 
> time as well:
>
> auto a = A ?? B;
>
> if `A` is not null, assign `A` to `a`. Otherwise assign `B` to 
> `a`.

This is also known as "||". :-)

It only requires the change that || return the merged truthy type 
of its parameters rather than bool. For instance, for objects 'a 
|| b' would merge to the most derived superclass of a and b.