warnings for missing type signatures

[henrylaxen]

Hi Michael,
When I use $(makeLenses ''AnswerMap) I get warnings like:

Top-level binding with no type signature:
  unAnswerMap :: Functor f =>
                 (IM.IntMap (Map PlayerId Answer)
                  -> f (IM.IntMap (Map PlayerId Answer)))
                 -> AnswerMap -> f AnswerMap

I tried adding a type signature before the makeLenses, but GHC complains:

The type signature for ‘unAnswerMap’ lacks an accompanying binding

I like to write my code so that it compiles without warnings. I know I could turn the off with

{-# OPTIONS_GHC -fno-warn-missing-signatures #-}

but I would rather not. Any suggestions?