All Unordered Pairs of Elements in a Range

["Nordlöw" via Digitalmars-d-learn]

On Saturday, 13 December 2014 at 23:08:13 UTC, H. S. Teoh via 
Digitalmars-d-learn wrote:
> Sounds like:
>
> 	https://issues.dlang.org/show_bug.cgi?id=6788
>
>
> T

I guess what's missing here is to make it work for ForwardRanges, 
right?