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jail: Mute -Wunused-but-set-variable for yynerrs.
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Authored by jhb on Jun 20 2023, 4:34 PM.
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Details

Summary

This is in the generated parser when using %pure-parser.

y.tab.c:382:14: error: variable 'yynerrs' set but not used [-Werror,-Wunused-but-set-variable]

int      yynerrs;
         ^

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rG FreeBSD src repository
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