code: public static ErrorMessageFactory shouldNotContainAtIndex(Object actual, Object expected, Index index) {
      return new ShouldNotContainAtIndex(actual, expected, index);
    }
docs: Creates a new </code>{@link ShouldNotContainAtIndex}</code>.
  
  @param actual the actual value in the failed assertion.
  @param expected value expected to be in {@code actual}.
  @param index the index of the expected value.
  @return the created {@code ErrorMessageFactory}.