scalaz/scalaz — pull request #644 by maxpow4h (2014-02-12 09:35:45+00:00)
Title: You can have a Functor for a type of set

And in scala, we can do implicit conversions.

To be applied after the other pull request.

This lets us write more programs, such as having a set of values, mapping it to a partially applied function, then applying that set of functions to an argument.