[isabelle-dev] ISABELLE_GHC/quickcheck

[Andreas Lochbihler]

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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