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z3str3: don't crash when finding initial bounds for a regex that has no solutions (#4276)

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Murphy Berzish 2020-05-11 19:41:55 -05:00 committed by GitHub
parent e254e890a1
commit bd0180925b
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1 changed files with 3 additions and 2 deletions
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src/smt/theory_str_regex.cpp
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@ -1154,8 +1154,9 @@ namespace smt {
expr_ref rhs2(m_autil.mk_ge(strlen, m_autil.mk_numeral(nonzero_lower_bound, true)), m);
rhs.push_back(rhs2);
} else {
// shouldn't happen
UNREACHABLE();
// probably no solutions at all; just assume that 0 is a (safe) lower bound
regex_last_lower_bound.insert(str, rational::zero());
rhs.reset();
}
}
// TODO upper bound check