[Haskell-cafe] question about "How to Write a Haskell Program" tutorial

[Simon Marlow]

Donald Bruce Stewart wrote:
> mvanier:
>> First off, I apologize if this has come up before.  As far as I can
>> tell, the mailing list archives don't have a search function.  I'm
>> running ghc-6.6 and haddock-0.8, both compiled from source.
>>
>> I'm working my way through the "How to Write a Haskell Program"
>> tutorial (which is a great idea, thanks guys!), and everything works
>> fine until I get to the part about creating the haddock
>> documentation. When I run:
>>
>> $ runhaskell Setup.hs haddock
>>
>> I get this:
>>
>> Preprocessing executables for haq-0.0...
>> Running Haddock for haq-0.0...
>> Warning: cannot use package haq-0.0:
>>    ghc-pkg failed
>>
>> With verbosity:
>>
>> $ runhaskell Setup.hs haddock -v
>>
>> I get this:
>>
>> Preprocessing executables for haq-0.0...
>> Running Haddock for haq-0.0...
>> /usr/local/packages/haskell-misc/bin/haddock --html
>> --odir=dist/doc/html/haq --title=haq --use-package=haq-0.0
>> --use-package=base-2.0 dist/build/tmp/Haq.hs
>> Warning: cannot use package haq-0.0:
>>    ghc-pkg failed
>>
>
> Ah yes, I get this too when using ghc 6.6.
> With ghc 6.4.2 the haddock goes through fine.
>
> Updating haddock to 0.8 and the ghc-pkg error is still there.
> But the docs seem to be generated ok:
>     Main
>     Synopsis
>     main :: IO ()
>     Documentation
>     main :: IO ()
>     main runs the main program
>     Produced by Haddock version 0.8
>
> Simon, know what's going on?

Fixed.  The error is non-fatal (as you noticed) and was introduced in a recent version of Cabal.

Cheers,
        Simon