GHCi Package problem?

[Martin Erwig]

On Feb 3, 2005, at 8:21 AM, Simon Marlow wrote:

> On 03 February 2005 16:11, Martin Erwig wrote:
>
>> On Feb 3, 2005, at 2:13 AM, Simon Marlow wrote:
>>
>>>>
>>>>    Prelude> Data.Graph.Inductive.Example.clr486
>>>>
>>>>    GHCi runtime linker: fatal error: I found a duplicate definition
>>>>       for symbol
>>>>    _DataziGraphziInductiveziInternalziFiniteMap_Empty_closure
>>>>       whilst processing object file
>>>>    ./Data/Graph/Inductive/Internal/FiniteMap.o This could be caused
>>>> by:
>>>>       * Loading two different object files which export the same
>>>> symbol
>>>>       * Specifying the same object file twice on the GHCi command
>>>> line
>>>>       * An incorrect `package.conf' entry, causing some object to
>>>>    be         loaded twice. GHCi cannot safely continue in this
>>>> situation.  Exiting now. Sorry.
>>>>
>>>> I don't know what to do about this.
>>>
>>> Looks like GHCi is trying to load an object file for a module that is
>>> already present in the package.  If
>>> Data.Graph.Inductive.Internal.FiniteMap is present in the fgl
>>> package, then you shouldn't also have it in the current directory,
>>
>> I don't.
>>
>> There is another FiniteMap.hi (and FiniteMap.p_hi) in
>>
>>     /usr/local/lib/ghc-6.2/imports/Data
>>
>> Could this be the offender?
>
> No.  The error message says that it is trying to load
> ./Data/Graph/Inductive/Internal/FiniteMap.o.  but that module is 
> already
> part of the fgl package isn't it?  (when I said current directory, I
> really meant "relative to the current directory").

Now I see. You are right! After a simple "cd .." the error
disappears.

Thanks a lot,
Martin