code: func (e *Engine) ExecuteRaw(src string, wr io.Writer, binding interface{}) (err error) {
  	tmpl, err := raymond.Parse(src)
  	if err != nil {
  		return err
  	}
  	parsed, err := tmpl.Exec(binding)
  	if err != nil {
  		return err
  	}
  	_, err = wr.Write([]byte(parsed))
  	return
  }
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