anchor.diff:  	| XorAssign
   	| AndAssign
   	| OrAssign
  -	| LeftShift
  -	| RightShift
  +	| (Less Less)
  +	| (Greater Greater)
   	| RightShiftAssign
   	| LeftShiftAssign
   	| Equal
  
positive.code: 	| Tilde
  	| Not
  	| Assign
  	| Less
  	| GreaterEqual
  	| PlusAssign
  
negative.code: initcapture: And? Identifier initializer;
  
  lambdaDeclarator:
  	LeftParen parameterDeclarationClause? RightParen Mutable? exceptionSpecification?
  		attributeSpecifierSeq? trailingReturnType?;
  
  postfixExpression:
  