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Though grammar rules and semantic actions are enough to write a fully functional parser, it can be useful to process some additional information, especially symbol locations.
The way locations are handled is defined by providing a data type, and actions to take when rules are matched.
3.6.1 Data Type of Locations Specifying a data type for locations. 3.6.2 Actions and Locations Using locations in actions. 3.6.3 Default Action for Locations Defining a general way to compute locations.
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