def METHOD_NAME():
    tp = relay.TypeVar("")
    ty = relay.TupleType([tp, relay.TensorType([], "int32")])
    x = relay.Var("x", ty)
    y = relay.Var("y")
    let = relay.Let(x, y, x)
    fvl = free_vars(let)
    assert len(fvl) == 1
    assert fvl[0] == y
    ftvl = free_type_vars(let)
    assert len(ftvl) == 1
    assert ftvl[0] == tp