package main

import (
    "fmt"
    "sync"
    "time"
)

var N = 1

type T interface{}

func main() {
    var wg sync.WaitGroup
    ch := make(chan T)
    wg.Add(1)
    go func() {
        defer wg.Done()
        test(ch)
    }() 
    for i := 0; i < N; i++ {
        ch <- 1
    }   
    close(ch)
    wg.Add(1)
    go func() {
        defer wg.Done()
        test(ch)
    }() 
    wg.Wait()
}

func test(ch chan T) T { 
    t := time.Now()
    var v T 
    var ok bool
    for i := 0; i < N; i++ {
        v, ok = <-ch
    }   
    fmt.Printf("%v, closed: %v\n", time.Since(t), !ok)
    return v
}