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(bison.info)C Declarations

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The C Declarations Section
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   The C DECLARATIONS section contains macro definitions and
declarations of functions and variables that are used in the actions in
the grammar rules.  These are copied to the beginning of the parser
file so that they precede the definition of `yyparse'.  You can use
`#include' to get the declarations from a header file.  If you don't
need any C declarations, you may omit the `%{' and `%}' delimiters that
bracket this section.