Right. Then something in the ISABELLE_GHC mechanism does not work, it’s 
definitely set to the right path.

Cheers,
Gerwin

On 21 Jul 2014, at 8:40 am, Andreas Lochbihler <andreas.lochbih...@inf.ethz.ch> 
wrote:

> The Native_Word entry in the AFP contains a number of quickcheck[narrowing] 
> calls that are set up such that they are tested only if ISABELLE_GHC is set. 
> Therefore, there cannot be an error message about quickcheck narrowing if 
> ISABELLE_GHC is not set.
> 
> Andreas
> 
> On 19/07/14 21:30, Gerwin Klein wrote:
>> Just had a very strange experience with ISABELLE_GHC.
>> 
>> You will have noticed that the AFP test failed the last few days with GHC 
>> compilation errors.
>> 
>> The AFP test settings included the line
>> ISABELLE_GHC=/opt/local/bin/ghc
>> 
>> Apparently, this caused sessions like Native_Word to fail, even though that 
>> is where ghc is installed on this machine (macbroy2). ghc also happens to be 
>> in the PATH on macbroy2 (pointing to the same /opt/local/bin/ghc), so in an 
>> act of desperation I tried locally removing the above line on the isatest 
>> account. Voila, Native_Word builds fine.
>> 
>> This was on isabelle 2bfbeb0e69cd and afp 4ea6558c319c.
>> 
>> However: on my laptop, with ISABELLE_GHC=/usr/bin/ghc, everything works 
>> fine. Either it’s something about the path or something about the macbroyX 
>> machines.
>> 
>> Any ideas what could be going on?
>> 
>> Cheers,
>> Gerwin
>> 
>> 
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