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fix #3822

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-06 16:33:00 -07:00
parent bcbc774b79
commit 6761bf1495
3 changed files with 17 additions and 1 deletions
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5
src/muz/fp/horn_tactic.cpp
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@ -266,7 +266,10 @@ class horn_tactic : public tactic {
switch (is_reachable) {
case l_true: {
// goal is unsat
if (produce_proofs) {
if (!m_ctx.is_monotone()) {
is_reachable = l_undef;
}
else if (produce_proofs) {
proof_ref proof = m_ctx.get_proof();
pc = proof2proof_converter(m, proof);
g->assert_expr(m.get_fact(proof), proof, nullptr);