The yylex function in parse.y in some versions of the ruby source bears 
the #line pp directive indicating it came from a lex input file called 
lex.l, but I can't find it anywhere, and lex output is so godawful that 
I've made no progress in deconstructing it down to its original input. 
Does anyone know where I could get a copy of the original lex input? 
I'm working on a form of ruby for my own operating system.

Thanks,
-George