What happens with the next code:

package main

func main() {
    var dataStream chan interface{}
    <-dataStream
}

What happens with this piece of code?

package main

import "fmt"

func main() {
    cc := make(chan int)
    close(cc)
    r := <- cc
    fmt.Printf("%d", r)
}

What happens with this piece of code?

package main

func main() {
    var dataStream chan interface{}
    close(dataStream)
}

What happens with this piece of code?

package main

import "fmt"

func main() {

    chanOwner := func() <-chan int {
        resultStream := make(chan int, 5)
        go func() {
            defer close(resultStream)
            for i := 0; i <= 5; i++ {
                resultStream <- i
            }
        }()
        return resultStream
    }
    resultStream := chanOwner()
    for result := range resultStream {
        fmt.Printf("Received: %d\n", result)
    }

    fmt.Println("Done receiving!")
}