我是編程新手，不知道在我的客戶端 golang 程序的源代碼中使用令牌生成客戶端 api 函數(shù)。尋求一些建議。太感謝了。源碼包：https ://pkg.go.dev/github.com/gravitational/teleport/api/client#Client.UpsertToken函數(shù)源代碼：func (c *Client) UpsertToken(ctx context.Context, token types.ProvisionToken) error {    tokenV2, ok := token.(*types.ProvisionTokenV2)    if !ok {        return trace.BadParameter("invalid type %T", token)    }    _, err := c.grpc.UpsertToken(ctx, tokenV2, c.callOpts...)    return trail.FromGRPC(err)}My code:package mainimport (    "context"    "crypto/tls"    "fmt"    "log"    "os"    "strings"    "time"    "github.com/gravitational/teleport/api/client"    "github.com/gravitational/teleport/api/client/proto"    "google.golang.org/grpc")// Client is a gRPC Client that connects to a Teleport Auth server either// locally or over ssh through a Teleport web proxy or tunnel proxy.//// This client can be used to cover a variety of Teleport use cases,// such as programmatically handling access requests, integrating// with external tools, or dynamically configuring Teleport.type Client struct {    // c contains configuration values for the client.    //c Config    // tlsConfig is the *tls.Config for a successfully connected client.    tlsConfig *tls.Config    // dialer is the ContextDialer for a successfully connected client.    //dialer ContextDialer    // conn is a grpc connection to the auth server.    conn *grpc.ClientConn    // grpc is the gRPC client specification for the auth server.    grpc proto.AuthServiceClient    // closedFlag is set to indicate that the connnection is closed.    // It's a pointer to allow the Client struct to be copied.    closedFlag *int32    // callOpts configure calls made by this client.    callOpts []grpc.CallOption}/*type ProvisionToken interface {    Resource    // SetMetadata sets resource metatada    SetMetadata(meta Metadata)    // GetRoles returns a list of teleport roles    // that will be granted to the user of the token    // in the crendentials}輸出：語法錯誤而不是創(chuàng)建令牌