(bison.info) C Code

 
 The Additional C Code Section
 -----------------------------
 
    The ADDITIONAL C CODE section is copied verbatim to the end of the
 parser file, just as the C DECLARATIONS section is copied to the
 beginning.  This is the most convenient place to put anything that you
 want to have in the parser file but which need not come before the
 definition of `yyparse'.  For example, the definitions of `yylex' and
 `yyerror' often go here.   Parser C-Language Interface Interface.
 
    If the last section is empty, you may omit the `%%' that separates it
 from the grammar rules.
 
    The Bison parser itself contains many static variables whose names
 start with `yy' and many macros whose names start with `YY'.  It is a
 good idea to avoid using any such names (except those documented in this
 manual) in the additional C code section of the grammar file.

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