Function sum

packages/effect/test/Channel/reading.test.ts:159–167

(
        label: string,
        n: number
      )

          : Channel.succeed("end")

      const sum = (
        label: string,
        n: number
      ): Channel.Channel<never, number, unknown, unknown, void, unknown> =>
        Channel.readWith({
          onInput: (input: number) => sum(label, n + input),
          onFailure: () => Channel.fromEffect(Ref.update(ref, (array) => [...array, n])),
          onDone: () => Channel.fromEffect(Ref.update(ref, (array) => [...array, n]))
        })

      const channel = pipe(
        intProducer,