code: func (vm *VM) EvaluateSnippet(filename string, snippet string) (json string, formattedErr error) {
  	output, err := vm.evaluateSnippet(filename, snippet, evalKindRegular)
  	if err != nil {
  		return "", errors.New(vm.ErrorFormatter.Format(err))
  	}
  	json = output.(string)
  	return
  }
docs: // EvaluateSnippet evaluates a string containing Jsonnet code, return a JSON
  // string.
  //
  // The filename parameter is only used for error messages.