Ping Pong Actor based example in D language

PingPong.d

import std.stdio, std.concurrency;
import core.thread;
alias Thread.sleep sleep;

void ping() {
    Tid pong;
    try {
        for(;;){
            receive(
                (string s){
                    writeln("ping received ",s);
                    sleep(dur!"seconds"(1));
                    pong.send("ping");
                },
                (Tid newPong){ pong = newPong; }
            );
        }
    }catch(Exception e){}
}

void pong(Tid ping) {
    try {
        ping.send("pong");
        for(;;){
            receive(
                (string s){
                    writeln("pong received ",s);
                    sleep(dur!"seconds"(1));
                    ping.send("pong");
                }
            );
        }
    }catch(Exception e){}
}

void main() {
    auto a1 = spawn(&ping);
    auto a2 = spawn(&pong,a1);
    a1.send(a2);
    sleep(dur!"seconds"(10));
}