It will. Otherwise the example wouldn't make sense. There's one important detail I haven't clarified enough in that part of the readme.

For proper pipeline termination the context has to be cancelled. So it should have been be Like:

func main() { ctx, cancel := context.WithCancel(context.Background()) defer cancel()

    urls := rill.Generate(func(send func(string), sendErr func(error)) {
        for i := 0; i < 1000 && ctx.Err() == nil; i++ {
                send(fmt.Sprintf("https://example.com/file-%d.txt", i))
        }
    })
    ...

One of the reasons I've ommited context cancellation in this and some other examples is because everything's happening inside the main function. I'll probably add cancellations to avoid confusion.