@Deprecated
  @Override
  public final int hashCode() {
    throw new UnsupportedOperationException("Correspondence.hashCode() is not supported.");
  }
@Test
  @SuppressWarnings("deprecation") // testing deprecated method
  public void testHashCode_throws() {
    try {
      INSTANCE.hashCode();
      fail("Expected UnsupportedOperationException from Correspondence.hashCode");
    } catch (UnsupportedOperationException expected) {
    }
  }