我正在編寫一個代碼來處理組合warehouse[item[batch, qty]]然后[batch, qty]基于batch與 sum of的組合qty。我的代碼是：package mainimport "fmt"type Inventory struct {   //instead of: map[string]map[string]Pairs    Warehouse string    Item      string    Batches   Pairs} type Pairs []Pairtype Pair struct {    Key   string    Value float64}func main() {    fmt.Println("Hello, 世界")    var inventory = Inventory{} // or: new(Inventory) noth are working //warehouse[item[batch, qty]]    inventory.Warehouse = "DMM"    inventory.Item = "Helmet"    inventory.Batches = append(inventory.Batches, Pair{"Jan", 10})    inventory.Batches = append(inventory.Batches, Pair{"Jan", 30})    inventory.Batches = append(inventory.Batches, Pair{"Feb", 30})    fmt.Printf("%v\n", inventory)    inventory.Batches.group()}func (p *Pairs) group() {    sum := make(map[string]float64)    pairs := new(Pairs)    for _, el := range *p {        sum[el.Key] = sum[el.Key] + el.Value    }    fmt.Printf("%v %T\n", sum, sum)    for k, v := range sum {        pairs = append(*pairs, Pair{k, v})     // <--------------- here is the error    }    fmt.Printf("%v %T\n", pairs, pairs)}但是我在分組時遇到了上述錯誤：# _/C_/Users/HASAN~1.YOU/AppData/Local/Temp/present-048467841.\prog.go:36:9: cannot use append(*pairs, Pair literal) (type Pairs) as type *Pairs in assignmentProgram exited: exit status 2