How can you read and understand the source of *naryFun in functional.d?

[Andrej Mitrovic]

On 1/30/11, Philippe Sigaud <philippe.sigaud at gmail.com> wrote:
> If anyone is interested, I coded a n-args version of
> unaryFun/binaryFun called naryFun. If you use 'a', 'b', ... as args
> names, it can automatically determine the templated function arity.

Is this going in the next release? There's an nary template in
std.functional right now but it's commented out. It does look like an
older attempt that probably didn't work.