anchor.diff:  	;
   
   conversion_operator_declarator
  -	: (IMPLICIT | EXPLICIT) OPERATOR type OPEN_PARENS arg_declaration CLOSE_PARENS
  +	: (IMPLICIT | EXPLICIT) OPERATOR type_ OPEN_PARENS arg_declaration CLOSE_PARENS
   	;
   
   constructor_initializer
  
positive.code: 	| '~' unary_expression
  	| '++' unary_expression
  	| '--' unary_expression
  	| OPEN_PARENS type CLOSE_PARENS unary_expression
  	| AWAIT unary_expression // C# 5
  	| '&' unary_expression
  	| '*' unary_expression
  
negative.code: 	;
  
  argument
  	: (identifier ':')? refout=(REF | OUT)? (VAR | type_)? expression
  	;
  
  expression
  