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Clean up recent patches a little.
Reported by Akim Demaille.
* doc/bison.texinfo (Understanding): Fix typos.
* src/print.c (print_reductions): Don't use negated variable.
(cherry picked from commit 379261b3fd)
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@@ -7473,8 +7473,8 @@ useless: STR;
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@command{bison} reports:
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@example
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tmp.y: warning: 1 nonterminal useless in grammar
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tmp.y: warning: 1 rule useless in grammar
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calc.y: warning: 1 nonterminal useless in grammar
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calc.y: warning: 1 rule useless in grammar
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calc.y:11.1-7: warning: nonterminal useless in grammar: useless
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calc.y:11.10-12: warning: rule useless in grammar: useless: STR
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calc.y: conflicts: 7 shift/reduce
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