public static UFreeIdent create(CharSequence identifier) {
    return new AutoValue_UFreeIdent(StringName.of(identifier));
  }
@Test
  public void equality() {
    new EqualsTester()
        .addEqualityGroup(UFreeIdent.create("foo"))
        .addEqualityGroup(UFreeIdent.create("bar"))
        .testEquals();
  }