could not find module Control.Monad.Writer
Prelude> :m Control.Monad.Writer <no location info>: Could not find module `Control.Monad.Writer' Perhaps you meant Control.Monad.Fix (from base) Control.Monad.Zip (from base) Prelude> :m Control.Monad. Control.Monad.Fix Control.Monad.ST Control.Monad.ST.Lazy.Safe Control.Monad.ST.Safe Control.Monad.ST.Unsafe Control.Monad.Instances Control.Monad.ST.Lazy Control.Monad.ST.Lazy.Unsafe Control.Monad.ST.Strict Control.Monad.Zip
At first, I couldn't find
But now, I can find it though I'm not sure why it is found.
I remember I tried
ghc-pkg dump and
I've never tried any special things...
Mh... have to be familier with Haskell GHC environment.