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is_unambiguous: fix detection of empty languages

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* src/tests/unambig.test: New test case.  Reported by Ming-Hsien Tsai.
* src/twaalgos/sccfilter.cc: Always create an initial state.
* src/twaalgos/isunamb.cc: Speed up on empty languages.
* NEWS, THANKS: Update.
This commit is contained in:
Alexandre Duret-Lutz 2015-10-20 08:06:31 +02:00
parent 61bf5daab4
commit cd8e53de09
5 changed files with 29 additions and 5 deletions
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NEWS
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@ -65,6 +65,8 @@ New in spot 1.99.4a (not yet released)
* "ltlgrind -F FILENAME/COL" did not preserve other CSV columns.
* "ltlgrind --help" did not document FORMAT.
* unabbreviate could easily use forbidden operators.
* "autfilt --is-unambiguous" could fail to detect the nonambiguity
of some automata with empty languages.
New in spot 1.99.4 (2015-10-01)