Node:C Declarations, Next:Bison Declarations, Up:Grammar Outline
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.