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-rw-r--r--src/lempar.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lempar.c b/src/lempar.c
index cb6025e..2afaa6c 100644
--- a/src/lempar.c
+++ b/src/lempar.c
@@ -608,6 +608,7 @@ static void yy_reduce(
*/
%%
};
+ assert( yyruleno>=0 && yyruleno<sizeof(yyRuleInfo)/sizeof(yyRuleInfo[0]) );
yygoto = yyRuleInfo[yyruleno].lhs;
yysize = yyRuleInfo[yyruleno].nrhs;
yypParser->yyidx -= yysize;