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fix #2765

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This commit is contained in:
Nikolaj Bjorner 2019-12-01 15:05:38 -08:00
parent 23fcc21543
commit 9ebaf19e47
1 changed files with 3 additions and 2 deletions
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5
src/smt/theory_seq.cpp
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@ -1895,7 +1895,8 @@ bool theory_seq::check_length_coherence0(expr* e) {
r = assume_equality(e, emp);
expr* t;
unsigned idx;
if (r != l_true && is_tail(e, t, idx) && idx > m_max_unfolding_depth) {
if (r != l_true && is_tail(e, t, idx) &&
idx > m_max_unfolding_depth && m_max_unfolding_lit != null_literal) {
TRACE("seq", tout << "limit unfolding " << m_max_unfolding_depth << " " << mk_pp(e, m) << "\n";);
add_axiom(~m_max_unfolding_lit, mk_eq(e, emp, false));
}
@ -5449,7 +5450,7 @@ void theory_seq::add_at_axiom(expr* e) {
expr_ref_vector es(m);
expr_ref nth(m);
unsigned k = iv.get_unsigned();
if (k > m_max_unfolding_depth) {
if (k > m_max_unfolding_depth && m_max_unfolding_lit != null_literal) {
add_axiom(~m_max_unfolding_lit, i_ge_len_s);
}
else {