Haddock version during build

[David Waern]

Another issue: If Haddock is built during the GHC installation
process, does this mean it can only depend on boot packages? And if
so, would it be out of the question to add more boot packages
specifically for Haddock?

I'm asking since it would be *so* useful for Haddock to depend on
Neil's "derive" package. With this package, one can (soon) derive
Traversable instances for all of GHC's abstract syntax types. Having
these instances makes Haddock much easier to maintain. The renamer in
Haddock, for instance, becomes almost a one-liner and totally
resistant to changes in GHC's abstract syntax.

David