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It is possible that a non-internalized expression gets assigned to false immediately by internalization

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-04-01 11:48:15 -07:00
parent 42f421ee09
commit b1dc2f2be2
1 changed files with 9 additions and 1 deletions
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10
src/smt/theory_nseq.cpp
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@ -85,6 +85,7 @@ namespace smt {
std::function<sat::literal(expr*)> literal_if_false = [&](expr* e) {
bool is_not = m.is_not(e, e);
TRACE(seq, tout << "literal_if_false: " << mk_pp(e, m) << " internalized - " << ctx.e_internalized(e) << "\n");
if (!ctx.e_internalized(e))
return sat::null_literal;
literal lit = ctx.get_literal(e);
@ -94,6 +95,7 @@ namespace smt {
TRACE(seq, tout << "literal_if_false: " << lit << " " << mk_pp(e, m) << " is assigned false\n");
return lit;
}
TRACE(seq, tout << "literal_if_false: " << mk_pp(e, m) << " is assigned " << ctx.get_assignment(lit) << "\n");
return sat::null_literal;
};
@ -647,7 +649,8 @@ namespace smt {
};
ctx.push_trail(reset_vector(m_nielsen_literals));
for (auto const& c : m_nielsen.sat_node()->constraints()) {
auto lit = mk_literal(c.fml);
bool was_internalized = ctx.e_internalized(c.fml);
auto lit = mk_literal(c.fml);
m_nielsen_literals.push_back(lit);
switch (ctx.get_assignment(lit)) {
case l_true:
@ -664,6 +667,11 @@ namespace smt {
IF_VERBOSE(0, verbose_stream()
<< "nseq final_check: nielsen assumption " << c.fml << " is false\n";);
ctx.force_phase(lit);
if (!was_internalized) {
has_undef = true;
ctx.force_phase(lit);
break;
}
TRACE(seq, tout << "assigned to false: " << c.fml << "\n");
UNREACHABLE();
break;