When I look at the documentation of Control.Monad.Error [1] or Control.Applicative [2] it is not said that it re-exports Control.Monad.Instances. So maybe this behaviour is normal...
[1] http://hackage.haskell.org/packages/archive/mtl/2.0.1.0/doc/html/Control-Monad-Error.html [2] http://hackage.haskell.org/packages/archive/base/4.3.0.0/doc/html/Control-Applicative.html 2011/2/24 Yves Parès <[email protected]> > I have the same problem with instances of Functor. > For instance when I import Control.Applicative, to get the instance > "Functor ((->) a)" I also have to import Control.Monad.Instances. > > > 2011/2/23 Daniel Fischer <[email protected]>: > > On Wednesday 23 February 2011 14:14:46, Yves Parès wrote: > >> The latest, I think : > >> GHC 7.0.1, > >> mtl-2.0.1.0, > >> base-4.3.0.0 > > > > Hmm, that's exactly what I have. Weirder and weirder. > > For the moment, I'm out of ideas. > > >
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