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* custom error handling / error recovery, i.e. to prevent the parser to stop at the first error
* creating tokens, if you don't want to do that externally
* setting custom variables, especially for state tracking. e.g. in C++ you could save whether you are inside a ''private'', ''protected'' oder ''public'' section. then you could save this information inside each node of the class elements.
* additional verifications, lookaheads etc.