code: func (e *Engine) ExecuteRaw(src string, wr io.Writer, binding interface{}) (err error) {
  	tmpl, err := amber.Compile(src, amber.DefaultOptions)
  	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