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fix #1958

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-11-20 16:43:37 -08:00
parent 37ef3cbeb2
commit c95dbb47a3
1 changed files with 2 additions and 0 deletions
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2
src/smt/theory_seq.cpp
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@ -4822,6 +4822,7 @@ void theory_seq::add_extract_prefix_axiom(expr* e, expr* s, expr* l) {
/*
0 <= i <= len(s) => s = xe & i = len(x)
i < 0 => len(e) = 0
*/
void theory_seq::add_extract_suffix_axiom(expr* e, expr* s, expr* i) {
expr_ref x(mk_skolem(m_pre, s, i), m);
@ -4833,6 +4834,7 @@ void theory_seq::add_extract_suffix_axiom(expr* e, expr* s, expr* i) {
literal i_le_s = mk_simplified_literal(m_autil.mk_le(mk_sub(i, ls), zero));
add_axiom(~i_ge_0, ~i_le_s, mk_seq_eq(s, xe));
add_axiom(~i_ge_0, ~i_le_s, mk_eq(i, lx, false));
add_axiom(i_ge_0, mk_eq(zero, m_util.str.mk_length(e), false));
}