code: func (s *Engine) ExecuteRaw(src string, wr io.Writer, binding interface{}) (err error) {
  	if s.Middleware != nil {
  		src, err = s.Middleware("", src)
  		if err != nil {
  			return err
  		}
  	}
  
  	tmpl, err := template.New("").Parse(src)
  	if err != nil {
  		return err
  	}
  	return tmpl.Execute(wr, binding)
  }
docs: // ExecuteRaw receives, parse and executes raw source template contents
  // it's super-simple function without options and funcs, it's not used widely
  // implements the EngineRawExecutor interface