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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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2
src/smt/theory_seq.cpp
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@ -5208,7 +5208,7 @@ void theory_seq::add_nth_axiom(expr* e) {
expr_ref zero(m_autil.mk_int(0), m);
literal i_ge_0 = mk_simplified_literal(m_autil.mk_ge(i, zero));
literal i_ge_len_s = mk_simplified_literal(m_autil.mk_ge(mk_sub(i, mk_len(s)), zero));
add_axiom(~i_ge_0, i_ge_len_s, mk_eq(m_util.str.mk_unit(e), m_util.str.mk_at(s, i), false));
add_axiom(~i_ge_0, i_ge_len_s, mk_eq(m_util.str.mk_unit(e), m_util.str.mk_at(s, i), false));
}
}