[isabelle-dev] Fwd: status (AFP)

Stefan Berghofer berghofe at in.tum.de
Fri Apr 8 13:03:12 CEST 2011

Quoting Lukas Bulwahn <bulwahn at in.tum.de>:

> Hi,
> My changes caused this error.
> I am working on different compilation schemes in Quickcheck.
> Quickcheck registers its type-class based generator construction in the Datatype package in the HOL image.

Hi Lucas,

according to the trace, the exception occurs somewhere in the function
derive_datatype_props in datatype_data.ML. When taking a quick look at
the code, I noticed that thy2 is used in two places (lines 311 and 322)
after it has already been modified. Is that intentional, or could this
be related to this bug, too?


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