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fix bug in non-emptiness witness extraction

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-03-24 12:34:40 -07:00
parent da9d8c8694
commit 5803c6f202
7 changed files with 198 additions and 61 deletions
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3
src/smt/seq/seq_regex.cpp
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@ -503,7 +503,8 @@ namespace seq {
// -----------------------------------------------------------------------
lbool seq_regex::is_empty_bfs(euf::snode* re, unsigned max_states) {
SASSERT(re && re->get_expr());
if (!re)
return l_undef;
if (re->is_fail())
return l_true;
if (re->is_nullable())