You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spnego.go
    path of file: ./repos/sliver/implant/vendor/gopkg.in/jcmturner/gokrb5.v7/spnego
    
    the code of the file until where you have to start completion: // Package spnego implements the Simple and Protected GSSAPI Negotiation Mechanism for Kerberos authentication.
package spnego

import (
	"context"
	"errors"
	"fmt"

	"github.com/jcmturner/gofork/encoding/asn1"
	"gopkg.in/jcmturner/gokrb5.v7/asn1tools"
	"gopkg.in/jcmturner/gokrb5.v7/client"
	"gopkg.in/jcmturner/gokrb5.v7/gssapi"
	"gopkg.in/jcmturner/gokrb
    
func (s *SPNEGO) AcceptSecContext(ct gssapi.ContextToken) (bool, context.Context, gssapi.Status) {
	var ctx context.Context
	t, ok := ct.(*SPNEGOToken)
	if !ok {
		return false, ctx, gssapi.Status{Code: gssapi.StatusDefectiveToken, Message: "context token provided was not an SPNEGO token"}
	}
	t.settings = s.serviceSettings
	var oid asn1.ObjectIdentifier
	if t.Init {
		oid = t.NegTokenInit.MechTypes[0]
	}
	if t.Resp {
		oid = t.NegTokenResp.SupportedMech
	}
	if !(oid.Equal(gssapi.OID(gssapi.OIDKRB5)) || oid.Equal(gssapi.OID(gssapi.OIDMSLegacyKRB5))) {
		return false, ctx, gssapi.Status{Code: gssapi.StatusDefectiveToken, Message: "SPNEGO OID of MechToken is not of type KRB5"}
	}
	// Flags in the NegInit must be used 	t.NegTokenInit.ReqFlags
	ok, status := t.Verify()
	ctx = t.Context()
	return ok, ctx, status
}