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return unknown if m_array_weak was used and result is satisfiable

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-08-02 00:20:41 +08:00
parent 3f032e85e0
commit 0a29002c2f
6 changed files with 61 additions and 18 deletions
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10
src/ast/rewriter/seq_rewriter.cpp
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@ -954,6 +954,16 @@ br_status seq_rewriter::mk_seq_at(expr* a, expr* b, expr_ref& result) {
return BR_FAILED;
}
unsigned len = r.get_unsigned();
expr* a2 = nullptr, *i2 = nullptr;
if (m_util.str.is_at(a, a2, i2)) {
if (len > 0) {
result = m_util.str.mk_empty(m().get_sort(a));
}
else {
result = a2;
}
return BR_DONE;
}
expr_ref_vector as(m());
m_util.str.get_concat_units(a, as);