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tables: fix again the handling of useless tokens

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The right-shift added in c22902e360
("tables: fix handling for useless tokens") is incorrect.  In
particular, we need to reset the "new" bits.

Reported by Balázs Scheidler.
https://github.com/akimd/bison/issues/74

* src/tables.c (pos_set_set): Fix the right-shift.
This commit is contained in:
Akim Demaille
2021-03-07 08:19:36 +01:00
parent ef3adfa0fb
commit a774839ca8
2 changed files with 16 additions and 5 deletions
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6
NEWS
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@@ -2,6 +2,12 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Bug fixes
*** Fix Table Generation
In some very rare conditions, when there are many useless tokens, it was
possible to generate incorrect parsers.
* Noteworthy changes in release 3.7.5 (2021-01-24) [stable]