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check that a clause was not removed to fix issue #551

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-04-04 20:15:49 +02:00
parent ec5a4ba63d
commit ed1a5797fb
3 changed files with 30 additions and 11 deletions
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2
src/sat/sat_simplifier.cpp
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@ -401,7 +401,7 @@ namespace sat {
literal_vector::iterator l_it = m_bs_ls.begin();
for (; it != end; ++it, ++l_it) {
clause & c2 = *(*it);
if (*l_it == null_literal) {
if (!c2.was_removed() && *l_it == null_literal) {
// c2 was subsumed
if (c1.is_learned() && !c2.is_learned())
c1.unset_learned();