anchor.diff:  shiftExpression:
   	additiveExpression (shiftOperator additiveExpression)*;
   
  -shiftOperator: RightShift | LeftShift;
  +shiftOperator: (Greater Greater) | (Less Less);
   
   relationalExpression:
   	shiftExpression (
  
positive.code: initcapture: And? Identifier initializer;
  
  lambdaDeclarator:
  	LeftParen parameterDeclarationClause RightParen Mutable? exceptionSpecification?
  		attributeSpecifierSeq? trailingReturnType?;
  
  postfixExpression:
  
negative.code: 	captureList
  	| captureDefault (Comma captureList)?;
  
  captureDefault: And | Assign;
  
  captureList: capture (Comma capture)* Ellipsis?;
  
  