(
    tasks: [
        (
            id: "src",
            type: "tasks::IntegerSrcTask",
        ),
        (
            id: "top",
            type: "tasks::MyTask",
            config: {"threshold": 42},
        ),
        (
            id: "sink",
            type: "tasks::MergingSinkTask",
        ),
    ],
    templates: [
        (
          file: "sub.ron",
          params: {"instance": 1, "threshold": 20},
        )
    ],
    cnx: [
        (src: "src", dst: "top", msg: "i32"),
        (src: "src", dst: "bottom1", msg: "i32"),
        (src: "top", dst: "sink", msg: "i32"),
        (src: "bottom1", dst: "sink", msg: "i32"),
    ],
)