anchor.diff:      
   annotationTypeElementRest
       :   type annotationMethodOrConstantRest ';'
  -    |   normalClassDeclaration ';'?
  -    |   normalInterfaceDeclaration ';'?
  +    |   classDeclaration ';'?
  +    |   interfaceDeclaration ';'?
       |   enumDeclaration ';'?
       |   annotationTypeDeclaration ';'?
       ;
  
positive.code:     |   interfaceGenericMethodDecl
      |   'void' Identifier voidInterfaceMethodDeclaratorRest
      |   interfaceDeclaration
      |   classDeclaration
      ;
      
  interfaceMethodOrFieldDecl
  
negative.code:     ;
      
  enumConstant
      :   annotation* Identifier arguments? classBody?
      ;
      
  enumBodyDeclarations
  