Check for infinite loops matching the empty string at parse time.
Check for infinite loops matching the empty string at parse time.

Frky/mujs,ccxvii/mujs,BOGY/mujs,earthling42/mujs,ccxvii/mujs,ccxvii/mujs,ccxvii/mujs,evanlabs/mujs,lsm/mujs,thurday/mujs,guiquanz/mujs