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by kazinator
325 days ago
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Without a comprehensive test suite you can easily break a recursive descent parser. By adding code into some function to handle something new, you can accidentally prevent some existing syntax from being recognized. It has been my eperience that if you have a LALR parser that reports no errors at generation time, and you add something such that there are still no errors, you've not ruined any existing syntax. That could be a theorem. |
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