... and the sixth wasn't far behind!

[Andrei Alexandrescu via Digitalmars-d]

On 6/12/15 1:53 PM, Adam D. Ruppe wrote:
> The di generation is actually fairly simple code, these are probably all
> pretty low hanging - I'd encourage anyone who wants some easy entry into
> dmd hacking to take a look at these.

Word. To make it easier to compare notes: 
https://github.com/D-Programming-Language/phobos/pull/3407 -- Andrei