Parser - eg. grammar for func. declarations


Handles eg: extern/static function_type function(arguments) { body }
    %start file
    file
        : external_definition
        | file external-definition
        ;
    external_definition
        : function_definition { }
        | declaration {
            if marked 'static', be so.
            otherwise assume 'extern' type
    function_definition
        : function_declarator function_body { /* main(void) { ... } */
             assume it returns int
          }
        | declaration_specifiers function_declarator function_body
          /* eg. void function(int foo) { ... }, type is 'void' */
          }