Go: default print format

slice, map即使为nil打印格式和空元素的情况一样, chan,func,interface,pointer为nil时,打印<nil>

当chan,func,pointer赋值后,都打印地址, interface赋值后,永远打印其dynamic value的格式

package main

import "fmt"

type I interface {
    m()
}

type T []byte

func (t T) m() {}

type Integer int

func (integer Integer) m() {}

type S struct {
    Name string
}

func (s S) m() {}

func main() {
    var (
        i       I
        t       T
        integer Integer
        s       S
        ss      *S
    )
    fmt.Println(i, t, integer, s)
    i = t
    fmt.Println(i)
    i = integer
    fmt.Println(i)
    i = s
    fmt.Println(i)
    i = ss
    fmt.Println(i)

    i = T{45, 90}
    fmt.Println(i)
    i = Integer(88)
    fmt.Println(i)
    i = S{
        Name: "tyui",
    }
    fmt.Println(i)
    i = &S{
        Name: "vbnm",
    }
    fmt.Println(i)

}