code: func RegisterPartialTemplate(name string, tpl *Template) {
  	partialsMutex.Lock()
  	defer partialsMutex.Unlock()
  
  	if partials[name] != nil {
  		panic(fmt.Errorf("Partial already registered: %s", name))
  	}
  
  	partials[name] = newPartial(name, "", tpl)
  }
docs: // RegisterPartialTemplate registers a global partial with given parsed template. That partial will be available to all templates.