anchor.diff:  
   interface_member_declaration
   	: attributes? NEW?
  -	  (UNSAFE? type
  +	  (UNSAFE? type_
   	    ( identifier type_parameter_list? OPEN_PARENS formal_parameter_list? CLOSE_PARENS type_parameter_constraints_clauses? ';'
   	    | identifier OPEN_BRACE interface_accessors CLOSE_BRACE
   	    | THIS '[' formal_parameter_list ']' OPEN_BRACE interface_accessors CLOSE_BRACE)
   	  | UNSAFE? VOID identifier type_parameter_list? OPEN_PARENS formal_parameter_list? CLOSE_PARENS type_parameter_constraints_clauses? ';'
  -	  | EVENT type identifier ';')
  +	  | EVENT type_ identifier ';')
   	;
   
   interface_accessors
  
positive.code: 	;
  
  explicit_anonymous_function_parameter
  	: refout=(REF | OUT)? type identifier
  	;
  
  implicit_anonymous_function_parameter_list
  
negative.code: 	;
  
  relational_expression
  	: shift_expression (('<' | '>' | '<=' | '>=') shift_expression | IS isType | AS type_)*
  	;
  
  shift_expression
  