[isabelle] a bug in Z3



Hello,
  I do not know whether this is important to report this or not, but I was
using Isabelle2019 and I received the following error message while
invoking Sledgehammer:

"z3": A prover error occurred:
exception Fail raised (line 222 of "~~/src/HOL/Tools/SMT/z3_proof.ML"):
Replaying the proof trace produced by Z3 failed: the bound "?0" is
undeclared; this indicates a bug in Z3

I hope that this information may be helpful in the development of
Isabelle2019.

Kind Regards,
José M.



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