Dan Doel wrote:
What do I have to import to get the Functor ((,) a) instance?

(Of course, I can define it myself, but this is not the point.)


In GHC 6.6 and above, you'll need to import Control.Monad.Instances (a bit of a weird place to put it, but I guess there's no Control.Functor and such).

If you have an earlier version than that, I'd say import Control.Monad.Writer at a guess.

Thanks a lot. Works!

BTW, what would have been the easiest way for me to find this out on my own? Somehow, I would have hoped to be able to navigate to the appropriate point from the mentioned place in the online docs, where it is stated that the instance in question exists.

Ciao, Janis.

--
Dr. Janis Voigtlaender
http://wwwtcs.inf.tu-dresden.de/~voigt/
mailto:[EMAIL PROTECTED]
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