Go面试题57

1: 下面哪一行代码会panic, 请说明原因?

package main

func main() {
    var x interface{}
    var y interface{} = []int{3,5}

    _ = x == x
    _ = x == y
    _ = y == y
}

2: 下面的代码输出什么?

var o = fmt.Print

func main() {
    c := make(chan int, 1)
    for range [3]struct{}{} {
        select {
            default:
                o(1)
            case <-c:
                o(2)
                c = nil
            case c <-1:
                o(3)
        }
    }
}