anchor.diff:      @GET
       @Produces(MediaType.TEXT_PLAIN)
       public String hello() {
  -        return "hello\n";
  +        return "hello";
       }
   }
   ----
  
positive.code: public class GreetingService {
  
      public String greeting(String name) {
          return "hello " + name + "\n";
      }
  
  }
  
negative.code: @Produces(MediaType.TEXT_PLAIN)
  public CompletionStage<String> hello() {
      return CompletableFuture.supplyAsync(() -> {
          return "hello";
      });
  }
  ----
  