What version of Go are you using (go version)?

$ go version go1.13.10 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOOS="linux"
GOHOSTARCH="amd64"
GOHOSTOS="linux"

What did you do?

type myConst int

const (
        zero myConst = iota
        one
        three = iota + 1
        foure
        five = iota + 1
)

func testIota() {
        // 3 4 5 why not 3 4 6
        fmt.Println(three, foure, five)
}

What did you expect to see?

why output is 3 4 5 not 3 4 6

What did you see instead?