[Haskell-cafe] Problem with haddock 2.3.0 (again)

Sean Leather leather at cs.uu.nl
Fri Dec 12 06:02:27 EST 2008

> > I've been using "cabal haddock" to run haddock on my package. I also
>> > get the same error using haddock directly:
>> >
>> > > $ haddock -odir=tmp --debug --verbose --html
>> > Generics/EMGM.hs
>> > > haddock: internal Haddock or GHC error: Maybe.fromJust: Nothing
>> Have you filed a ticket for this in the haddock trac so that he doesn't
>> forget?
>> http://trac.haskell.org/haddock/
> There seemed to be perhaps one or two tickets related, but I wasn't sure if
> any exactly matched the issue, so I created a new one with a minimal
> testcase.
> http://trac.haskell.org/haddock/ticket/68

And for anyone who later comes upon this thread seeking an answer to a
similar problem, this is apparently a bug in the GHC API on which Haddock is


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