[clean up warnings
John Meacham <john@repetae.net>**20100812102435
 Ignore-this: 582526a443397ee875d3530d892b704d
] hunk ./src/E/CPR.hs 12
-import E.FreeVars
hunk ./src/E/Demand.hs 16
-import Data.Monoid hiding(Product(..))
-import Data.Maybe
hunk ./src/E/TypeCheck.hs 16
-import Monad(when,liftM)