Golang转换多个返回值以匹配命名结果参数

有没有办法在不使用临时变量的情况下转换结果？

func main() {
    out,_ := bar("Example")
    fmt.Println(out)
}

func foo(s string) ([]byte,error) {
    return []byte(s),nil
}

func bar(in string) (out string,err error) {
    // is there a way to assign the result to out
    // casting the value to string in the same line
    // istead of using the tmp variable?
    tmp,err := foo(in)

    if err != nil {
        return "",err
    }
    return string(tmp),nil
}

我的想法是,如果可能的话,我可能会缩短代码

func bar(in string) (out string,err error) {
    // assuming there is a way to cast out to string
    out,err := foo(in)
    return
}

是否有意义？