[RESOLVED] flex "flex scanner push-back overflow"

[Nim]

This is screwed up. I've narrowed the issue down to one line in new_scanner.l:

EXP {EXP}{SP}("+"|"-"|"*"|"/"){SP}{VAL}|{VAL}

I ruled it further down to the recursive definition! I don't understand, and I must less care. I rewrote it without the {EXP} and now it works!

BINOP "+"|"-"|"*"|"/"
EXP_END ({SP}{BINOP}{SP}{VAL})*

and I rewrote the conditional regex:

{VAL}{EXP_END}{SP}(">"|"<"){SP}{VAL}{EXP_END}

win.