>>678

$ ghci
GHCi, version 6.10.4: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> :m + Control.Monad.Instances
Prelude Control.Monad.Instances> (+1) `fmap` (1, 2)
(1,3)

ってできたお。