为什么不能按指定的Go引用将字符串附加到字节片上？

Quote from the reference of append of Go

As a special case, it is legal to append a string to a byte slice, like this:
slice = append([]byte("hello "), "world"...)

But I find I can't do that as this snippet:

package main
import "fmt"

func main(){
    a := []byte("hello")
    s := "world"
    a = append(a, s) //*Error*: can't use s(type string) as type byte in append 
    fmt.Printf("%s",a)
}

What have I done wrong?

You need to use "..." as suffix in order to append a slice to another slice. Like this:

package main
import "fmt"

func main(){
    a := []byte("hello")
    s := "world"
    a = append(a, s...) // use "..." as suffice 
    fmt.Printf("%s",a)
}

You could try it here: http://play.golang.org/p/y_v5To1kiD