147     return Incref();  in Simplify()
155   return re->Incref();  in Copy()
162   return re->Incref();  in ShortVisit()
168     return re->Incref();  in PreVisit()
194       return re->Incref();  in PostVisit()
216         return re->Incref();  in PostVisit()
232         return re->Incref();  in PostVisit()
255         return re->Incref();  in PostVisit()
292   return re->Incref();  in PostVisit()
319       return Regexp::Star(re->Incref(), f);  in SimplifyRepeat()
323       return Regexp::Plus(re->Incref(), f);  in SimplifyRepeat()
331       nre_subs[i] = re->Incref();  in SimplifyRepeat()
332     nre_subs[min-1] = Regexp::Plus(re->Incref(), f);  in SimplifyRepeat()
342     return re->Incref();  in SimplifyRepeat()
355       nre_subs[i] = re->Incref();  in SimplifyRepeat()
360     Regexp* suf = Regexp::Quest(re->Incref(), f);  in SimplifyRepeat()
362       suf = Regexp::Quest(Concat2(re->Incref(), suf, f), f);  in SimplifyRepeat()
390   return re->Incref();  in SimplifyCharClass()