library;
import self as self;
import "dart:core" as core;
import "dart:isolate" as iso;

static field dynamic subscription = null;
static method onData(dynamic x) → void {
  core::print(x);
  self::subscription.cancel();
}
static method main() → dynamic {
  core::String string = core::String::fromCharCode(65);
  iso::ReceivePort port = iso::ReceivePort::•();
  self::subscription = port.{iso::ReceivePort::listen}(self::onData);
  port.{iso::ReceivePort::sendPort}.{iso::SendPort::send}(string);
}