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type S struct {
    A int
    B *int
    C float64
    d func() string
    e chan struct{}
}
func main() {
    s := S{
       A: 1,
       B: nil,
       C: 12.15,
       d: func() string {
          return "NowCoder"
       },
       e: make(chan struct{}),
    }
    _, err := json.Marshal(s)
    if err != nil {
       log.Printf("err occurred ..")
       return
    }
    log.Printf("everything is ok.")
    return
}

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func main() {
    nums := []int{-1, 2, 1, -4}
    target := 1
    r := threeSumClosest(nums, target)
    fmt.Println(r) // 2
}
func threeSumClosest(nums []int, target int) int {
    // ......
}