reader.ReadString('\n')这样怎么会报错？

```go reader := bufio.NewReader(strReader) r, _ = reader.ReadString('\n') //r, _ = reader.ReadString([]byte("\n")[0]) ``` 第一个报错：cannot use reader.ReadString('\n') (value of type string) as type rune in assignment 第二个报错：cannot use reader.ReadString([]byte("\n")[0]) (value of type string) as type rune in assignment go版本1.19.3，上面这两种方法不都是没错的吗？