Reduce parameters [was pi program]

[John Colvin via Digitalmars-d-learn]

On Monday, 28 September 2015 at 11:04:56 UTC, Russel Winder wrote:
> On Sat, 2015-09-26 at 10:46 +0000, John Colvin via 
> Digitalmars-d-learn wrote:
>> […]
>
> I guess the summary is: it's a breaking change, so do it. No we 
> can't do that it's a breaking change.
>
> Seems lame given all the other breaking changes that have been. 
> Sad given that reduce is probably the single most important 
> operation in parallel programming.

My thoughts exactly, even though it was partly me that pointed 
out the breaking changes...

I still think we should add fold[lr]? just to fix the ordering.