columnar struct storage template

[Adam D. Ruppe via Digitalmars-d-announce]

On Sunday, 29 January 2017 at 13:09:18 UTC, Nestor wrote:
> This no longer compiles on recent versions of DMD :(

Trivial fix though, it just needs to say "\n" instead of plain \n 
(it is missing quotes, D used to allow that for whatever stupid 
reason and has since been fixed).

Actually, tbh, I'm surprised it isn't a bigger fix needed given 
that that post is from 9 years ago!