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#1 Catch common yacc & lex errors

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nobody
None
5
2003-04-06
2003-04-06
Bill Cox
No

HackC should only generate yacc and lex files if they
will be close to legal. Failure to find reduce/reduce
and shift reduce conflicts is understandable, but
illegal syntax in lex keywords, and undefined
non-terminals should be caught up-front.

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