奇怪的go语言iota

package mainimport (        "fmt")const (        TestMin = -1
        TestA
        TestB = iota        TestC)func main() {        fmt.Printf("TestMin:%d\n", TestMin)
        fmt.Printf("TestA:%d\n", TestA)
        fmt.Printf("TestB:%d\n", TestB)
        fmt.Printf("TestC:%d\n", TestC)}

/*

TestMin:-1TestA:-1TestB:2TestC:3*/

package mainimport (    "fmt")const (
    i=1<<iota
    j=3<<iota
    k
    l
)func main() {  fmt.Println("i=",i)
  fmt.Println("j=",j)
  fmt.Println("k=",k)
  fmt.Println("l=",l)}

i= 1j= 6k= 12l= 24

    i=1<<iota
    j=3<<iota
    k
    l

    i=1<<0
    j=3<<1
    k=3<<2
    l=3<<3