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feat(library/unifier): do not create a case-split for choice constraints that produce only one alternative

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2014-06-26 18:52:13 -07:00
parent 443022d840
commit 50e21586b0
1 changed files with 8 additions and 3 deletions
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11
src/library/unifier.cpp
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@ -799,9 +799,14 @@ struct unifier_fn {
auto r = rlist.pull();
justification j = mk_composite1(c.get_justification(), m_type_jst.second);
if (r) {
justification a = mk_assumption_justification(m_next_assumption_idx);
add_case_split(std::unique_ptr<case_split>(new choice_case_split(*this, m, m_type_jst.second, r->second)));
return process_choice_result(m, r->first, mk_composite1(j, a));
if (r->second.is_nil()) {
// there is only one alternative
return process_choice_result(m, r->first, j);
} else {
justification a = mk_assumption_justification(m_next_assumption_idx);
add_case_split(std::unique_ptr<case_split>(new choice_case_split(*this, m, m_type_jst.second, r->second)));
return process_choice_result(m, r->first, mk_composite1(j, a));
}
} else {
set_conflict(j);
return false;