Oh, I just installed the Haskell platform. 

I have 
Haddock version 2.4.2, (c) Simon Marlow 2006
Ported to use the GHC API by David Waern 2006-2008

But I noticed that my bad comments were in the description of the cabal file, not the source file.

So that might be a new ticket?

On Wed, Aug 26, 2009 at 1:04 PM, David Waern <david.waern@gmail.com> wrote:
2009/8/26 Peter Verswyvelen <bugfact@gmail.com>:
> Ouch, with all the great Haskell parsers like Parsec around I think I was
> expecting a line/column number :-)
> But I see a ticket is already open for this
> http://trac.haskell.org/haddock/ticket/83

Yes, and the line-number part of that ticket has been fixed in 2.4.2
and higher versions. So the best idea is to upgrade Haddock.

David