anchor.diff:    });
     return result;
   }
  -
   """;
   
   
  
positive.code:   core.String toString()
        => 'DetailedApiRequestError(status: $status, message: $message)';
  }
  
  """;
  
  
  
negative.code:  * Specifies options for resumable uploads.
   */
  class ResumableUploadOptions extends UploadOptions {
    static final core.Function ExponentialBackoff = (core.int failedAttempts) {
      // Do not retry more than 5 times.
      if (failedAttempts > 5) return null;
  
      // Wait for 2^(failedAttempts-1) seconds, before retrying.
      // i.e. 1 second, 2 seconds, 4 seconds, ...
      return new core.Duration(seconds: 1 << (failedAttempts - 1));
    };
  
    /**
     * Maximum number of upload attempts per chunk.
     */
  