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fix unsound unfolding

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-11-24 17:25:56 -08:00
parent 6ddbc9cd38
commit 96043216e5
1 changed files with 3 additions and 1 deletions
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4
src/smt/theory_seq.cpp
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@ -5509,7 +5509,8 @@ void theory_seq::propagate_step(literal lit, expr* step) {
rational lo;
rational _idx;
if (lower_bound(s, lo) && lo.is_unsigned() && m_autil.is_numeral(idx, _idx) && lo >= _idx) {
VERIFY(m_autil.is_numeral(idx, _idx));
if (lower_bound(s, lo) && lo.is_unsigned() && lo >= _idx) {
// skip
}
else {
@ -5580,6 +5581,7 @@ void theory_seq::add_theory_assumptions(expr_ref_vector & assumptions) {
}
bool theory_seq::should_research(expr_ref_vector & unsat_core) {
TRACE("seq", tout << unsat_core << " " << m_util.has_re() << "\n";);
if (!m_util.has_re()) {
return false;
}