Hello,

The following compiles as well as evades scrutiny by go Vet (and many a 
human reviewer) resulting in perplexing bugs. What purpose calling append() 
with only one argument serves? Shouldn't it be banned?


```
var byteArray= []byte{'A', 'B',}

func main() {
buf:=[]byte {'C'}
buf = append(byteArray)  //<--- gotche meant: buf = append(*buf*, byteArray)
fmt.Println(string(buf))
}
```
https://play.golang.org/p/jP8NGiEN9A

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