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fix unsoundness bug in axiomatization of str.at. #1067

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-06-13 19:02:59 -07:00
parent 6bce173248
commit a59ee8032c
3 changed files with 5 additions and 4 deletions
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4
src/smt/theory_seq.cpp
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@ -3567,8 +3567,8 @@ void theory_seq::add_at_axiom(expr* e) {
add_axiom(~i_ge_0, i_ge_len_s, mk_eq(one, len_e, false));
add_axiom(~i_ge_0, i_ge_len_s, mk_eq(i, len_x, false));
add_axiom(i_ge_0, mk_eq(s, emp, false));
add_axiom(~i_ge_len_s, mk_eq(s, emp, false));
add_axiom(i_ge_0, mk_eq(e, emp, false));
add_axiom(~i_ge_len_s, mk_eq(e, emp, false));
}
/**