struct Gen[T] {
    data T
}

fn (g Gen[T]) process() string {
    th := spawn g.internal()
    r := th.wait()
    return r
}

fn (g Gen[T]) internal() string {
    println(g.data * g.data)
    return '${g.data * g.data}'
}

fn test_spawn_method_on_generic_struct() {
    g := Gen[int]{
        data: 5
    }
    r1 := g.process()
    assert r1 == '25'

    r2 := g.internal()
    assert r2 == '25'
}