code: func (f *File) RenderL(templName string, params LiteralMap) (ret string, err error) {
  	spec := &Specifier{TemplateName: templName}
  	spec.Params, err = params.Convert()
  	if err != nil {
  		return
  	}
  	return f.Render(spec)
  }
docs: // RenderL renders a specified template with go literal arguments.