typelevel/shapeless-contrib — pull request #16 by stew (2014-05-15 20:16:08+00:00)
Title: Automatically derive instances of scalacheck's Shrink

Add a TypeClass instance for org.scalacheck.Shrink. Shrink is a useful feature of scalacheck whereby upon finding a failing example, scalacheck will shrink the example down to a "smaller" example.