day 15 

On day 14 we started hacking on Scalaz. First, typeclass instances for Vector was added to import Scalaz._. Next, we rolled back <*> to be infix ap. Finally, we added an implicit converter to unpack A as [α]A, which helps compiler find Applicative[({type λ[α]=Int})#λ].

All three of the pull requests were accepted by the upstream! Here’s how to sync up:

$ git co scalaz-seven
$ git pull --rebase

Let’s take a moment to see some of the typeclasses I was looking.