anchor.diff:  LineComment
   :
   	'//' ~[\r\n]* -> skip
  -;
  +;
positive.code: 
  aliasdeclaration
  :
  	Using Identifier attributespecifierseq? '=' typeid ';'
  ;
  
  simpledeclaration
  
negative.code: 
  alignmentspecifier
  :
  	Alignas '(' thetypeid '...'? ')'
  	| Alignas '(' constantexpression '...'? ')'
  ;
  
  