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strength: fix is_terminal()

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Fix #198.  Reported by Maximilien Colange.

* spot/twaalgos/strength.cc (is_terminal): Test that no accepting
transition lead to a rejecting SCC.
* tests/core/strength.test: Add test case.
* spot/twaalgos/strength.hh, spot/twa/twa.hh, doc/org/concepts.org:
Adjust documentation.
* NEWS: Mention the fix.
This commit is contained in:
Alexandre Duret-Lutz 2016-11-28 16:19:05 +01:00
parent 2fbc75f439
commit 9bc978a90f
6 changed files with 133 additions and 15 deletions
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5
NEWS
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@ -5,6 +5,11 @@ New in spot 2.2.1.dev (Not yet released)
* scc_filter() had a left-over print statement that would print
"names" when copying the name of the states.
* is_terminal() should reject automata that have accepting
transitions going into rejecting SCCs. The whole point of
being a terminal automaton is that reaching an accepting
transition guarantees that any suffix will be accepted.
New in spot 2.2.1 (2016-11-21)
Bug fix: