(flex.info)What is the difference between YYLEX_PARAM and YY_DECL?

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What is the difference between YYLEX_PARAM and YY_DECL?
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YYLEX_PARAM is not a flex symbol.  It is for Bison.  It tells Bison to
pass extra params when it calls yylex() from the parser.

   YY_DECL is the Flex declaration of yylex.  The default is similar to
this:

     #define int yy_lex ()