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fix #5014

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-02-12 16:01:33 -08:00
parent 85f0084e9c
commit 612cc5cfba
9 changed files with 53 additions and 6 deletions
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1
src/smt/seq_axioms.cpp
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@ -813,6 +813,7 @@ void seq_axioms::add_str_to_code_axiom(expr* n) {
literal len_is1 = mk_eq(mk_len(e), a.mk_int(1));
add_axiom(~len_is1, mk_ge(n, 0));
add_axiom(~len_is1, mk_le(n, seq.max_char()));
add_axiom(~len_is1, mk_eq(n, seq.mk_char2int(mk_nth(e, 0))));
if (!seq.str.is_from_code(e))
add_axiom(~len_is1, mk_eq(e, seq.str.mk_from_code(n)));
add_axiom(len_is1, mk_eq(n, a.mk_int(-1)));