class MutableSpan implements Cloneable {

  static void remove(Object[] input, int i) {
    int j = i + 2;
    for (; j < input.length; i += 2, j += 2) {
      if (input[j] == null) break; // found null key
      input[i] = input[j];
      input[i + 1] = input[j + 1];
    }
    input[i] = input[i + 1] = null;
  }

  public  MutableSpan();
  public  MutableSpan(TraceContext context, @Nullable MutableSpan defaults);
  public  MutableSpan(MutableSpan toCopy);

}