yacc error handling

Objective is to cleanup memory allocations on parse errors. One
solution - Supplement rules with error rules in whose actions one can
do cleanup. Another solution - thread all allocated memory off a
global structure that can be destroyed at end of parsing.


Does anybody have any refinements or alternate suggestions?


Thanks.
Ajay
[I thread the allocated memory, it's more robust since it doesn't depend
on writing perfectly correct error rules. -John]

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