Re: [Haskelldb-users] Bug: overlapping instances in HDBRec.hs

[Bjorn B. <d00...@dt...>]

Volker Wysk wrote:
> I get the following compiler error:
> 
> Overlapping instance declarations:
>   In module Database.HaskellDB.HDBRec: Database.HaskellDB.HDBRec.HasField f (RecCons f a r)
>   In module Database.HaskellDB.HDBRec: Database.HaskellDB.HDBRec.HasField f (RecCons g a r)
> 
> Overlapping instance declarations:
>   In module Database.HaskellDB.HDBRec: Database.HaskellDB.HDBRec.SelectField f (RecCons f a r) a
>   In module Database.HaskellDB.HDBRec: Database.HaskellDB.HDBRec.SelectField f (RecCons g b r) a
> 
> The compiler flag -fallow-overlapping-instances is needed. I'm not sure
> what triggers the error, since the compiler doesn't tell.

Are you using "-package haskelldb"? That should turn on overlapping 
instances.

If you are using "-package haskelldb" and still getting the error above, 
  check the extra_ghc_opts section of the output from:

$ ghc-pkg -s haskelldb

It should contain -fallow-overlapping-instances. If not, something has 
gone wrong in the installation, please provide your "ghc-pkg -s 
haskelldb" output.

Concerning all the other problems that you have reported, the HaskellDB 
CVS repo is still not working, I expect to work on moving to SourceForge 
CVS tonight.

/Bjorn