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ignore propagation on units

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-11-11 15:10:44 -08:00
parent 6a72a4fc00
commit 4d0bc8c8b3
2 changed files with 2 additions and 2 deletions
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2
src/sat/sat_solver.cpp
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@ -920,7 +920,7 @@ namespace sat {
if (c[0] == not_l)
std::swap(c[0], c[1]);
CTRACE("propagate_bug", c[1] != not_l, tout << "l: " << l << " " << c << "\n";);
if (c.was_removed() || c[1] != not_l) {
if (c.was_removed() || c.size() == 1 || c[1] != not_l) {
// Remark: this method may be invoked when the watch lists are not in a consistent state,
// and may contain dead/removed clauses, or clauses with removed literals.
// See: method propagate_unit at sat_simplifier.cpp