func E0(params ...interface{}) {

    if params != nil && len(params) > 0 {
        switch params[len(params)-1].(type) {
        case error:
            panic(params[len(params)-1])
        }
    }

}
func E1[T any](params ...interface{}) T {
    var t T
    if params != nil && len(params) > 0 {
        switch params[len(params)-1].(type) {
        case error:
            panic(params[len(params)-1])
        }
        t = params[0].(T)
    }
    return t
}
func E2[T1, T2 any](params ...interface{}) (T1, T2) {
    var t1 T1
    var t2 T2
    if params != nil && len(params) > 0 {
        switch params[len(params)-1].(type) {
        case error:
            panic(params[len(params)-1])
        }
        t1 = params[0].(T1)
        t2 = params[1].(T2)
    }
    return t1, t2
}
func E3[T1, T2, T3 any](params ...interface{}) (T1, T2, T3) {
    var t1 T1
    var t2 T2
    var t3 T3
    if params != nil && len(params) > 0 {
        switch params[len(params)-1].(type) {
        case error:
            panic(params[len(params)-1])
        }
        t1 = params[0].(T1)
        t2 = params[1].(T2)
        t3 = params[2].(T3)
    }
    return t1, t2, t3
}
func E4[T1, T2, T3, T4 any](params ...interface{}) (T1, T2, T3, T4) {
    var t1 T1
    var t2 T2
    var t3 T3
    var t4 T4
    if params != nil && len(params) > 0 {
        switch params[len(params)-1].(type) {
        case error:
            panic(params[len(params)-1])
        }
        t1 = params[0].(T1)
        t2 = params[1].(T2)
        t3 = params[2].(T3)
        t4 = params[3].(T4)
    }
    return t1, t2, t3, t4
}
func HandleError(err *error) {
    if e := recover(); e != nil {
        *err = fmt.Errorf("%e", e)
        return
    }
}

func plus(a, b int) (int, error) {
    if a+b >= 0 {
        return a + b, nil
    }
    return 0, errors.New("params error")
}

func test() (a int, e error) {
    //e error必须要在返回值里面定义，不然会拿不到
    defer HandleError(&e)
    a += E1[int](plus(0, 1))
    a += E1[int](plus(3, 1))
    //出现error会中断执行
    a += E1[int](plus(-5, 1))
    return
}

func main() {
    fmt.Println(test())
}