Что это за язык программирования?

package main

import (
	"log"
	"time"
)

type Ping struct {}
type Pong struct {}

var ping = Ping{}
var pong = Pong{}

const procDelay = 500 * time.Millisecond

func main() {
	pings, pongs := make(chan Ping), make(chan Pong)
	defer close(pings)
	defer close(pongs)

	// process 1
	go func() {
		for _ = range pings {
			log.Println("    ping")
			time.Sleep(procDelay)
			pongs <- pong
		}
	}()

	// process 2
	go func() {
		for _ = range pongs {
			log.Println("        pong")
			time.Sleep(procDelay)
			pings <- ping
		}
	}()

	pings <- ping
	time.Sleep(5 * time.Second)
	log.Println("bye!")
}