[Haskell-cafe] Polymorphic case for this lens transformer?

Hi all, I have been using this lens transformer http://lpaste.net/113159. However, I can't seem to find a way to implement the polymorphic case (i.e. Lens instead of Lens'). What am I missing? Hans - Hans Höglund Composer, conductor and developer hans [at] hanshoglund.se hanshoglund.com https://twitter.com/hanshogl https://soundcloud.com/hanshoglund http://github.com/hanshoglund