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stutter: fix closure() on Fin-acceptance

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From a report by Anton Pirogov.

* NEWS: Mention the bug.
* spot/twaalgos/stutter.cc: Fix it.
* tests/core/stutter-tgba.test: Test it.
* THANKS: Add Anton.
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Alexandre Duret-Lutz 2018-03-23 18:20:35 +01:00
parent b25ec6fe02
commit 69a3e8486e
4 changed files with 41 additions and 2 deletions
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NEWS
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@ -42,6 +42,14 @@ New in spot 2.5.1.dev (not yet released)
- twa_run methods will now diagnose cases where the cycle is
unexpectedly empty instead of segfaulting.
- spot::closure(), used by default for testing stutter-invariance,
was using an optimization incorrect if the acceptance condition
had some Fin(x). Consequently stutter-invariance tests for
automata, for instance with "autfilt --is-stutter-invariant",
could be to be wrong (even if the input does not use Fin(x), its
complement, used in the stutter-invariance test likely will).
Stutter-invariance checks of LTL formulas are not affected.
New in spot 2.5.1 (2018-02-20)
Library: