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address some crashes reported by Caleb

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-06-20 18:35:16 -07:00
parent 6524a70c32
commit 02f34ea4b1
3 changed files with 8 additions and 4 deletions
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3
src/smt/seq_regex.cpp
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@ -525,7 +525,8 @@ namespace smt {
lits.reset();
lits.push_back(~lit);
if (!m.is_true(cond)) {
lits.push_back(th.mk_literal(mk_forall(m, hd, mk_not(m, cond))));
expr_ref ncond(mk_not(m, cond), m);
lits.push_back(th.mk_literal(mk_forall(m, hd, ncond)));
}
expr_ref is_empty1 = sk().mk_is_empty(p.second, re().mk_union(u, r));
lits.push_back(th.mk_literal(is_empty1));