为什么这个基本的例行程序返回true？

I'm new to Go and i'm trying to understand why this code returns:

12
true

Heres the simple program:

package main

import "fmt"

func foo(c chan int, myValue int) {
    c <- myValue * 2
}

func main() {
    c := make(chan int)
    go foo(c, 3)
    go foo(c, 6)

    v1, v2 := <-c

    fmt.Println(v1)
    fmt.Println(v2)
}

Is it true just because it gets some random value back?

The second value in a two value receive assigment is a boolean reporting whether the communication succeeded. The value v1 is the value received from the channel. The value v2 is true because communication succeeded.