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remfin: fix tra_to_tba

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This fixes a complementation bug reported by Juraj Major and Tereza
Šťastná.

* spot/twaalgos/remfin.cc (is_scc_tba_type): Fix the condition for
handling Fin-alone pairs.
* tests/core/complement.test: Add Juraj & Tereza's test case.
* NEWS: Mention it.
This commit is contained in:
Alexandre Duret-Lutz 2019-12-05 22:27:19 +01:00
parent e778965730
commit c36b1588fc
3 changed files with 28 additions and 2 deletions
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5
spot/twaalgos/remfin.cc
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2015-2018 Laboratoire de Recherche et Développement
// Copyright (C) 2015-2019 Laboratoire de Recherche et Développement
// de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -126,7 +126,8 @@ namespace spot
auto scc_pairs = rs_pairs_view(aut_pairs.pairs(), scc_acc);
// If there is one aut_fin_alone that is not in the SCC,
// any cycle in the SCC is accepting.
if (scc_pairs.fins_alone().proper_subset(aut_pairs.fins_alone()))
auto aut_fin_alone = aut_pairs.fins_alone();
if ((scc_acc & aut_fin_alone) != aut_fin_alone)
{
for_each_edge(aut, si.edges_of(scc), keep, [&](unsigned e)
{