Cannot get this C++ example migrated to D

[Skippy]

On Sunday, 16 April 2023 at 06:39:17 UTC, Mike Parker wrote:
>
> `t1` is default-initialized, so it's null.
>     test t1, t2 = new test();

silly me. I should have picked that up myself. thanks.

> Ditto for t3. Classes are reference objects, not value objects, 
> so you must explicitly instantiate instances if you want them 
> to be non-null.
>     test t3;

again, silly me. I should have picked that up myself. thanks.

I wish D had value type classes as well.