// It is necessary here because otherwise the builder() method
  // would be inherited from the emulated ImmutableSet.
  // TODO(cpovirk): should we be including other methods from the shim here and
  // in ImmutableSortedMap?
  @Deprecated
  public static <E> ImmutableSortedSet.Builder<E> builder() {
    throw new UnsupportedOperationException();
  }

 * <p>This class uses (possibly repeated) invocations of {@link java.lang.System#gc()} to cause
 * finalization to happen. However, a call to {@code System.gc()} is specified to be no more than a
 * hint, so this technique may fail at the whim of the JDK implementation, for example if a user
 * specified the JVM flag {@code -XX:+DisableExplicitGC}. But in practice, it works very well for
 * ordinary tests.
 *

 * <p>This class uses (possibly repeated) invocations of {@link java.lang.System#gc()} to cause
 * finalization to happen. However, a call to {@code System.gc()} is specified to be no more than a
 * hint, so this technique may fail at the whim of the JDK implementation, for example if a user
 * specified the JVM flag {@code -XX:+DisableExplicitGC}. But in practice, it works very well for
 * ordinary tests.
 *

    try {
      japaneseToSpanish.apply("Ni");
      fail();
    } catch (IllegalArgumentException e) {
    }
    assertEquals("Tres", japaneseToSpanish.apply("San"));
    try {
      japaneseToSpanish.apply("Shi");
      fail();
    } catch (IllegalArgumentException e) {
    }

    new EqualsTester()
        .addEqualityGroup(japaneseToSpanish, Functions.compose(integerToSpanish, japaneseToInteger))

        synchronized ( this.LOCK ) {

            /*
             * Yes, there is the potential to drop packets
             * because we might close the socket during a
             * request. However the chances are slim and the
             * retry code should ensure the overall request
             * is serviced. The alternative complicates things
             * more than I think is worth it.
             */

        entities.put("or", "\u2228");
        entities.put("cap", "\u2229");
        entities.put("cup", "\u222a");
        entities.put("int", "\u222b");
        entities.put("there4", "\u2234");
        entities.put("sim", "\u223c");
        entities.put("cong", "\u2245");
        entities.put("asymp", "\u2248");
        entities.put("ne", "\u2260");
        entities.put("equiv", "\u2261");
        entities.put("le", "\u2264");

        entities.put("or", "\u2228");
        entities.put("cap", "\u2229");
        entities.put("cup", "\u222a");
        entities.put("int", "\u222b");
        entities.put("there4", "\u2234");
        entities.put("sim", "\u223c");
        entities.put("cong", "\u2245");
        entities.put("asymp", "\u2248");
        entities.put("ne", "\u2260");
        entities.put("equiv", "\u2261");
        entities.put("le", "\u2264");