`restricted` member variables

[Dennis]

On Thursday, 23 June 2022 at 11:04:40 UTC, forkit wrote:
> Thanks to dkorpel, for 'volunteering' his time and effort, to 
> really move this forward (not as a new language feature, but as 
> something you can try out, if you want).
>
> So I'd say, the straedgy worked, just fine ;-)
>
> Making 'noise' was, sadly, the only way to get any movement on 
> this.

Note that I don't actually want the feature myself, but I was 
curious how complex it would actually be to implement, and wanted 
to show that the discussion does not have to be a harsh conflict 
between two self-interested camps. Maybe when there's something 
concrete on the table we can all stop bickering over principles, 
definitions, quotes from authority figures etc. and get some real 
world experience. And when it gets rejected, at least you can 
still forkit ;)

I did NOT want to show that making noise on the forum is the way 
to get your feature in. Please don't keep bringing up the same 
points over and over, especially in other threads like [this 
one](https://forum.dlang.org/post/jjxxvzaehgzzwucapmap@forum.dlang.org).