anchor.diff:     ;
   
   op_type_spec
  -   : param_type_spec
  -   | KW_VOID
  +   : annapps
  +     ( param_type_spec
  +     | KW_VOID
  +     )
      ;
   
   parameter_decls
  -   : LEFT_BRACKET param_decl (COMMA param_decl)* RIGHT_BRACKET
  -   | LEFT_BRACKET RIGHT_BRACKET
  +   : LEFT_BRACKET ( param_decl (COMMA param_decl)* )? RIGHT_BRACKET
      ;
   
   param_decl
  -   : param_attribute param_type_spec simple_declarator
  +   : annapps param_attribute annapps param_type_spec annapps simple_declarator
      ;
   
   param_attribute
  
positive.code:    ;
  
  init_param_decl
     : init_param_attribute param_type_spec simple_declarator
     ;
  
  init_param_attribute
  
negative.code:    ;
  
  event_abs_decl
     : KW_ABSTRACT KW_EVENTTYPE identifier value_inheritance_spec LEFT_BRACE export* RIGHT_BRACE
     ;
  
  event_decl
  