package mainvar lettersLower = []rune("abcdefghijklmnopqrstuvwxyz")var lettersUpper = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ")func main() { x := append(lettersLower, lettersUpper)}為什么這不起作用?我怎樣才能附加lettersLower和lettersUpper?prog.go:7: cannot use lettersUpper (type []rune) as type rune in appendhttps://play.golang.org/p/ovx_o2rKPC
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