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#5467

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This commit is contained in:
Nikolaj Bjorner 2021-10-12 10:16:15 -07:00
parent c3549ec784
commit 52032b9ef8
9 changed files with 38 additions and 21 deletions
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6
src/ast/rewriter/seq_axioms.cpp
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@ -1142,8 +1142,8 @@ namespace seq {
/**
~contains(a, b) => ~prefix(b, a)
~contains(a, b) => ~contains(tail(a), b) or a = empty
~contains(a, b) & a = empty => b != empty
~contains(a, b) => ~contains(tail(a), b)
a = empty => tail(a) = empty
~(a = empty) => a = head + tail
*/
void axioms::unroll_not_contains(expr* e) {
@ -1165,7 +1165,7 @@ namespace seq {
expr_ref bound_tracker = m_sk.mk_length_limit(s, k);
expr* s0 = nullptr;
if (seq.str.is_stoi(s, s0))
s = s0;
s = s0;
add_clause(~bound_tracker, mk_le(mk_len(s), k));
return bound_tracker;
}