error "generalize fmap"  = map  ==> fmap

-- AMP fallout
error "generalize mapM"  = mapM  ==> traverse
error "generalize mapM_" = mapM_ ==> traverse_
error "generalize forM"  = forM  ==> for
error "generalize forM_" = forM_ ==> for_
error "Avoid return" =
    return ==> pure
    where note = "return is obsolete as of GHC 7.10"