anchor.diff:  	(And | AndAnd) attributeSpecifierSeq?
   	| nestedNameSpecifier? Star attributeSpecifierSeq? cvqualifierseq?;
   
  -cvqualifierseq: cvQualifier cvqualifierseq?;
  +cvqualifierseq: cvQualifier+;
   
   cvQualifier: Const | Volatile;
   
  
positive.code: opaqueEnumDeclaration:
  	enumkey attributeSpecifierSeq? Identifier enumbase? Semi;
  
  enumkey: Enum | (Class | Struct)?;
  
  enumbase: Colon typeSpecifierSeq;
  
  
negative.code: 
  unaryExpression:
  	postfixExpression
  	| (PlusPlus | MinusMinus | unaryOperator | Sizeof) unaryExpression
  	| Sizeof (
  		LeftParen theTypeId RightParen
  		| Ellipsis LeftParen Identifier RightParen
  	)
  	| Alignof LeftParen theTypeId RightParen
  	| noExceptExpression
  	| newExpression
  