NSTRING_SET_AMBIG_REDUCE 3214 mbstring/oniguruma/regcomp.c     if (wp != prev) NSTRING_SET_AMBIG_REDUCE(snode);
NSTRING_SET_AMBIG_REDUCE 3274 mbstring/oniguruma/regcomp.c       if (wp != sn->end) NSTRING_SET_AMBIG_REDUCE(node);