Lots of low hanging fruit in Phobos

[bearophile]

w0rp:

>> 3. Give up on maximum performance (fiber-based coroutine range)
>
> I think that's what I would go for.

Yet there's no need for that. You can have your pie and eat it 
too, with a small cost. D can rewrite code that contains a yield 
in an efficient finite state machine (this is what ShedSkin 
compiler for Python does, and perhaps the C# compiler does the 
same).

Bye,
bearophile