Code fails with linker error. Why?

[eles via Digitalmars-d-learn]

On Monday, 6 October 2014 at 19:03:13 UTC, John Colvin wrote:
> On Monday, 6 October 2014 at 16:04:02 UTC, eles wrote:
>> On Monday, 6 October 2014 at 15:44:36 UTC, John Colvin wrote:
>>> On Monday, 6 October 2014 at 12:36:41 UTC, ketmar via 
>>> Digitalmars-d-learn wrote:
>>>> On Mon, 06 Oct 2014 11:54:55 +0000
>>>> John Colvin via Digitalmars-d-learn 
>>>> <digitalmars-d-learn at puremagic.com>

> In order to get access to private variables from another 
> compilation unit, yes, you need some nasty hackiness. I haven't 
> presented such a hack though.

I know. Was not serious.