code: func (t *BTTracer) AddOptions(options []string, v ...string) []string {
  	if options != nil {
  		return append(options, v...)
  	}
  
  	t.m.Lock()
  	defer t.m.Unlock()
  
  	t.options = append(t.options, v...)
  	return nil
  }
docs: // See bcd.Tracer.AddOptions().