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: collection.go
    path of file: ./repos/plumber/vendor/github.com/gsterjov/go-libsecret
    
    the code of the file until where you have to start completion: package libsecret

import "github.com/godbus/dbus"


type Collection struct {
  conn *dbus.Conn
  dbus  dbus.BusObject
}


func NewCollection(conn *dbus.Conn, path dbus.ObjectPath) *Collection {
  return &C
    
func (collection *Collection) Delete() error {
  var prompt dbus.ObjectPath

  err := collection.dbus.Call("org.freedesktop.Secret.Collection.Delete", 0).Store(&prompt)
  if err != nil {
    return err
  }

  if isPrompt(prompt) {
    prompt := NewPrompt(collection.conn, prompt)

    _, err := prompt.Prompt()
    if err != nil {
      return err
    }
  }

  return nil
}