2011/2/26 Daniel Fischer <daniel.is.fischer@googlemail.com>

On Saturday 26 February 2011 12:54:02, Yves Parès wrote:
> 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...

I don't think so. Instances are automatically propagated, they can't be
hidden once they're in scope. Functor, Monad, Either and (->) are all
available in the Prelude, so unless you have NoImplicitPrelude, the
instances ought to be in scope from any transitive dependency.
And they are in scope for me when I import Control.Monad.Error or
Control.Applicative, so something is amiss if they're not in scope for you.