在Go中强制转换多个返回值的惯用方式是什么？

您可以单行执行吗，还是需要使用临时变量（例如我在下面的示例中所做的那样）？

package main

import "fmt"

func oneRet() interface{} {
    return "Hello"
}

func twoRet() (interface{}, error) {
    return "Hejsan", nil
}

func main() {
    // With one return value, you can simply do this
    str1 := oneRet().(string)
    fmt.Println("String 1: " + str1)

    // It is not as easy with two return values
    //str2, err := twoRet().(string) // Not possible
    // Do I really have to use a temp variable instead?
    temp, err := twoRet()
    str2 := temp.(string)
    fmt.Println("String 2: " + str2 )


    if err != nil {
        panic("unreachable")
    }   
}

顺便说一句，casting当涉及到接口时会调用它吗？

i := interface.(int)