Dead link in hoogle.

[kindaro]

I wanted to hoogle MonadIO today and I received a link to transformers package that says:

Page not found
Sorry, it's just not here.

I see #478 and it looks resolved: "I think the docbuilder has now been running ok for some time", -- but, if the observation above is legitimate, there are still some docs amiss.

[gbaz]

The docs indeed built correctly. You can see them here: http://hackage.haskell.org/package/transformers-0.5.5.0

You'll notice that there's no Control.Monad.IO.Class there. This is because that is now exported from base and not transformers: http://hackage.haskell.org/package/transformers-0.5.5.0/transformers.cabal

The module listing on the hackage page I believe shows all possible modules a package can export (regardless of conditionals). But the docs are built in a specific environment (in particular, using a recent ghc) and thus are not built for modules that are not exported in recent ghcs.

I'm not quite sure of the right way to tidy up what I see at this point as an "interaction effect" between various systems' views of docs. Ideally the hoogledb would point to the new location of the module. Hackage has no way of knowing that the module has been relocated (as opposed to just removed), so I'm not sure what we could do there? Poss related to #560