我寫了 2 個函數v1GetSessionID和v1SessionIDforBind。/* * v1GetSessionID */func v1GetSessionID(c *gin.Context,                                         app *firebase.App,                                         client *firestore.Client,                                         stripcallGetSession func() func(internalUserID string, customerID string) (sessionid string, err error)) (sessionid string, err error) {    defer erapse.ShowErapsedTIme(time.Now())    idToken := c.Param("idToken")    user, err := idToken2User(app, idToken)    if err != nil {return}    customerID, err := user.getCustomerID()    if err != nil {return}    sessionid, err = stripcallGetSession()(user.getInternalID(), customerID)    return}/* * v1SessionIDforBind */func v1SessionIDforBind(c *gin.Context, app *firebase.App, client *firestore.Client) {    defer erapse.ShowErapsedTIme(time.Now())    var requestBody JsonPurchaseBindSessionRequest    if err := c.ShouldBindJSON(&requestBody); err != nil {        okngErrorOut(c, err)        return    }    stripcallGetSession := func() func(internalUserID string, customerID string) (sessionid string, err error) {            return func(internalUserID string, customerID string)(sessionid string, err error){return stripeGetSessionIDforBind(requestBody, internalUserID, customerID)}    }    sessionid, err := v1GetSessionID(c, app, client, stripcallGetSession)()    if err != nil {        log.Println(err)        okngErrorOut(c, err)    } else {        c.JSON(http.StatusOK, gin.H{            "SessionID": sessionid,        })    }}在后一個函數的中間，我將前者稱為如下；    sessionid, err := v1GetSessionID(c, app, client, stripcallGetSession)()但是 go 編譯器在單值上下文中將其指示為多值。go run *.go# command-line-arguments./v1handler.go:332:34: multiple-value v1GetSessionID() in single-value contextv1GetSessionID 返回 sessionid 字符串的 2 個值，err 錯誤，我已通過sessionid，err收到它。那么為什么我有上面提到的錯誤呢？go 版本為：go1.14.4 linux/arm。