can't work with interface var

[nowind]

code as following failed: var m interface{}=[]int{1,2} slType:=reflect2.TypeOf(m).(reflect2.SliceType) slType.LengthOf(m) //<--here i can't use &m

[whisper-bye]

+1

type message struct {
        crc uint16
}

msg := &message{}
unpack(b, msg)

func unpack(b []byte, msg interface{}) error {
    buf := bytes.NewBuffer(b)
    typ := reflect2.TypeOf(msg)
    structType := typ.(*reflect2.UnsafeStructType) // panic
...

[whisper-bye]

I fingure it out, it should be reflect2.TypeOfPtr(msg).Elem()