(flex.info)About yyscan_t

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19.4.7 About yyscan_t
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'yyscan_t' is defined as:

          typedef void* yyscan_t;

   It is initialized by 'yylex_init()' to point to an internal
structure.  You should never access this value directly.  In particular,
you should never attempt to free it (use 'yylex_destroy()' instead.)