anchor.diff:  //the annotation
   userAnnotation 
       : annotationName annotationArguments?
  -    -> ^(USER_ANNOTATION annotationName annotationArguments?)
  +    -> ^(ANNOTATION annotationName annotationArguments?)
       ;
   
   annotationArguments
  
positive.code: 
  importDeclaration  
      : 'import' importPath ('.' wildcard | alias)? ';'
      -> ^(IMPORT_DECL ^(TYPE_NAME importElement*) wildcard? alias?)
      ;
      
  importPath
  
negative.code:     ;
  
  annotation
      : declarationModifier -> ^(ANNOTATION declarationModifier) 
      | userAnnotation
      ;
  
  //TODO: we could minimize backtracking by limiting the 
  