golang append syntax error: missing statement after label : <pre><code>    fmt.Print("Text to send: ")
    text, _ := readerConsole.ReadString('\n')

    sizen := (int)(unsafe.Sizeof(text))
    fmt.Print(sizen)
    var bs []byte
    binary.BigEndian.PutUint32(bs, sizen)

    b := []byte(text)
    a: = append(bs, b...)
</code></pre>

<p>Go formatter says error
"syntax error: missing statement after label" on append</p>
