public static UReturn create(UExpression expression) {
    return new AutoValue_UReturn(expression);
  }
@Test
  public void equality() {
    new EqualsTester()
        .addEqualityGroup(UReturn.create(ULiteral.stringLit("foo")))
        .addEqualityGroup(UReturn.create(ULiteral.intLit(5)))
        .addEqualityGroup(UReturn.create(null))
        .testEquals();
  }