*   if (value < 0) {
 *     throw new IllegalArgumentException("input is negative: " + value);
 *   }
 *   // calculate square root
 * }
 * }</pre>
 *
 * <p>to be replaced with the more compact
 *
 * <pre>{@code
 * public static double sqrt(double value) {
 *   checkArgument(value >= 0, "input is negative: %s", value);
 *   // calculate square root
 * }
 * }</pre>
 *

    return new TypeSet();
  }

  /**
   * Returns the generic form of {@code superclass}. For example, if this is {@code
   * ArrayList<String>}, {@code Iterable<String>} is returned given the input {@code
   * Iterable.class}.
   */
  public final TypeToken<? super T> getSupertype(Class<? super T> superclass) {
    checkArgument(
        this.someRawTypeIsSubclassOf(superclass),