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fix #4069

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-23 20:52:19 -07:00
parent 8c5993d9a6
commit 9c3f0190f4
9 changed files with 272 additions and 310 deletions
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2
src/smt/seq_skolem.h
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@ -85,6 +85,8 @@ namespace smt {
bool is_skolem(symbol const& s, expr* e) const;
bool is_skolem(expr* e) const { return seq.is_skolem(e); }
bool is_unit_inv(expr* e) const { return is_skolem(symbol("seq.unit-inv"), e); }
bool is_unit_inv(expr* e, expr*& u) const { return is_unit_inv(e) && (u = to_app(e)->get_arg(0), true); }
bool is_tail(expr* e) const { return is_skolem(m_tail, e); }
bool is_seq_first(expr* e) const { return is_skolem(m_seq_first, e); }
bool is_indexof_left(expr* e) const { return is_skolem(m_indexof_left, e); }