If you are using the `@n'-feature (see section Special Features for Use in Actions) in
actions to keep track of the textual locations of tokens and groupings,
then you must provide this information in yylex. The function
yyparse expects to find the textual location of a token just parsed
in the global variable yylloc. So yylex must store the
proper data in that variable. The value of yylloc is a structure
and you need only initialize the members that are going to be used by the
actions. The four members are called first_line,
first_column, last_line and last_column. Note that
the use of this feature makes the parser noticeably slower.
The data type of yylloc has the name YYLTYPE.
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