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(bison.info)Location Type

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Data Type of Locations
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   Defining a data type for locations is much simpler than for semantic
values, since all tokens and groupings always use the same type.

   The type of locations is specified by defining a macro called
`YYLTYPE'.  When `YYLTYPE' is not defined, Bison uses a default
structure type with four members:

     struct
     {
       int first_line;
       int first_column;
       int last_line;
       int last_column;
     }