code: func (iamRes *IAMResourceBuilder) Ref(resName string, delimiter ...string) *IAMResourceBuilder {
  	iamRes.resourceParts = append(iamRes.resourceParts,
  		gocf.Ref(resName))
  	for _, eachDelimiter := range delimiter {
  		iamRes.resourceParts = append(iamRes.resourceParts,
  			gocf.String(eachDelimiter))
  	}
  	return iamRes
  }
docs: // Ref inserts a go-cloudformation Ref entry