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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-18 19:11:59 -07:00
parent 9d6c870e97
commit 10edee48f3
1 changed files with 4 additions and 4 deletions
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8
src/ast/rewriter/seq_rewriter.cpp
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@ -1997,13 +1997,13 @@ expr_ref seq_rewriter::is_nullable(expr* r) {
return expr_ref(mk_and(m(), is_nullable(r1), is_nullable(r2)), m());
}
if (m_util.re.is_star(r) ||
m_util.re.is_opt(r) ||
m_util.re.is_full_seq(r)) {
m_util.re.is_opt(r) ||
m_util.re.is_full_seq(r)) {
return expr_ref(m().mk_true(), m());
}
if (m_util.re.is_full_char(r) ||
m_util.re.is_empty(r) ||
m_util.re.is_of_pred(r)) {
m_util.re.is_empty(r) ||
m_util.re.is_of_pred(r)) {
return expr_ref(m().mk_false(), m());
}
if (m_util.re.is_plus(r, r1)) {