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fix #2445 fix #2519

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-10-13 20:24:05 -07:00
parent 224cc8f8dd
commit 71d68b8fe0
5 changed files with 157 additions and 120 deletions
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5
src/ast/rewriter/seq_rewriter.cpp
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@ -1005,6 +1005,11 @@ br_status seq_rewriter::mk_seq_at(expr* a, expr* b, expr_ref& result) {
m_lhs.reset();
m_util.str.get_concat_units(a, m_lhs);
if (m_lhs.empty()) {
result = m_util.str.mk_empty(m().get_sort(a));
return BR_DONE;
}
unsigned i = 0;
for (; i < m_lhs.size(); ++i) {