Feature request for Haddock: cross-module name reference

[Sven Panne]

Another little wish for Haddock: It is currently possible to reference
names in scope via 'foo' and modules via "bar.baz.blah". But sometimes
it would be convenient to reference a name in another module without
importing it just for documentation purposes. Further note that
circularity in documentation is not uncommon. So a markup for this
task would be very nice. I'm not sure if the name should always be
rendered in a fully qualified way, because this tends to clutter up
the documentation. On the other hand it would be better in printed
(i.e. non-mouse-clickable) docs. Hmmm...

Does this make sense?

Cheers,
    S.