leak.go

package main

import (
	"time"
)

func main() {
	print(q())
}

func q() int {
	// when use unbuffered channel, only the fastest goroutine is consumed,
	// and the rest of two will be leaked.
	resp := make(chan int)
	go func() {
		time.Sleep(1 * time.Second)
		resp <- 1
	}()
	go func() {
		time.Sleep(2 * time.Second)
		resp <- 2
	}()
	go func() {
		time.Sleep(3 * time.Second)
		resp <- 3
	}()
	return <-resp
}