return true;
      }
    }
  }

  @Override
  public int size() {
    return elements.length;
  }

  // We're careful to put only E instances into the array in the mainline.
  // (In the backport, we don't need this suppression, but we keep it to minimize diffs.)
  @SuppressWarnings("unchecked")
  @Override
  public UnmodifiableIterator<E> iterator() {

    version of the library.

5.  Our classes are not designed to protect against a malicious caller. You
    should not use them for communication between trusted and untrusted code.

6.  For the mainline flavor, we test the libraries using OpenJDK 8, 11, and 17
    on Linux, with some additional testing on newer JDKs and on Windows. Some
    features, especially in `com.google.common.io`, may not work correctly in

    ImmutableMap<String, Integer> copy = ImmutableMap.copyOf(original);
    assertMapEquals(copy, "one", 1, "two", 2, "three", 3);
    assertSame(copy, ImmutableMap.copyOf(copy));
  }

  // TODO(b/172823566): Use mainline testToImmutableMap once CollectorTester is usable to java7.
  public void testToImmutableMap_java7_combine() {
    ImmutableMap.Builder<String, Integer> zis =
        ImmutableMap.<String, Integer>builder().put("one", 1);