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fix #4937

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This commit is contained in:
Nikolaj Bjorner 2021-01-07 17:31:04 -08:00
parent 60ef60dff8
commit ac7d07ca58
2 changed files with 9 additions and 6 deletions
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9
src/smt/theory_seq.cpp
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@ -3028,9 +3028,11 @@ void theory_seq::new_eq_eh(dependency* deps, enode* n1, enode* n2) {
if (n1 != n2 && m_util.is_seq(e1)) {
theory_var v1 = n1->get_th_var(get_id());
theory_var v2 = n2->get_th_var(get_id());
if (m_find.find(v1) == m_find.find(v2)) {
if (v1 == null_theory_var || v2 == null_theory_var)
return;
}
if (m_find.find(v1) == m_find.find(v2))
return;
m_find.merge(v1, v2);
expr_ref o1(e1, m);
expr_ref o2(e2, m);
@ -3049,7 +3051,8 @@ void theory_seq::new_diseq_eh(theory_var v1, theory_var v2) {
enode* n2 = get_enode(v2);
expr_ref e1(n1->get_owner(), m);
expr_ref e2(n2->get_owner(), m);
SASSERT(n1->get_root() != n2->get_root());
if (n1->get_root() == n2->get_root())
return;
if (m_util.is_re(n1->get_owner())) {
m_regex.propagate_ne(e1, e2);
return;