[isabelle-dev] Conversions between ('a * 'a) set and 'a => 'a => bool relations
berghofe at in.tum.de
Sun Mar 4 23:21:39 CET 2012
Florian Haftmann wrote:
> * This is mainly a question to Stefan: there are some theorems commented
> out (e.g. »thm sym_INTER [to_pred]«) on which pred_set_conv chokes. I
> guess this is due to a higher-order situation, but I would be reassuring
> if you can confirm that.
this looks like a bug. The culprit seems to be function mk_to_pred_inst in
inductive_set.ML, which does not handle variables of type "... => T set"
properly. A similar problem might also occur with to_set. I'll try to fix
this before the next release.
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