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fix #6748

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destructive equality resolution uses an occurs check function that is only safe for quantifier-free formulas. In the special case where a bound variable is Boolean and occurs on a side of an equality the other side cannot have a quantifier.
This commit is contained in:
Nikolaj Bjorner 2023-06-07 15:59:25 -07:00
parent 57e92b2a59
commit 06a8987314
2 changed files with 3 additions and 3 deletions
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4
src/ast/rewriter/der.cpp
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@ -176,9 +176,9 @@ void der::reduce1(quantifier * q, expr_ref & r, proof_ref & pr) {
var * v = nullptr; var * v = nullptr;
expr_ref t(m); expr_ref t(m);
if (is_forall(q) && is_var_diseq(e, num_decls, v, t) && !occurs(v, t)) if (is_forall(q) && is_var_diseq(e, num_decls, v, t) && !has_quantifiers(t) && !occurs(v, t))
r = m.mk_false(); r = m.mk_false();
else if (is_exists(q) && is_var_eq(e, num_decls, v, t) && !occurs(v, t)) else if (is_exists(q) && is_var_eq(e, num_decls, v, t) && !has_quantifiers(t) && !occurs(v, t))
r = m.mk_true(); r = m.mk_true();
else { else {
expr_ref_vector literals(m); expr_ref_vector literals(m);

2
src/smt/smt_context_pp.cpp
View file

@ -635,7 +635,7 @@ namespace smt {
literal_vector lits; literal_vector lits;
const_cast<conflict_resolution&>(*m_conflict_resolution).justification2literals(j.get_justification(), lits); const_cast<conflict_resolution&>(*m_conflict_resolution).justification2literals(j.get_justification(), lits);
out << "justification " << j.get_justification()->get_from_theory() << ": "; out << "justification " << j.get_justification()->get_from_theory() << ": ";
// display_literals_smt2(out, lits); display_literals_smt2(out, lits);
break; break;
} }
default: default: