Catch exception

---

examples/dart-intro/catch_exception.dart

div(x, y) {
  return x ~/ y;
}

main()  {
  try {
    print(div(2, 1));
    print(div(1, 0));
    print(div(3, 1));
  } catch(exception, stackTrace) {
    print(exception);
    print(stackTrace);
  }
  print("still working");
}

2
IntegerDivisionByZeroException
#0  int.~/ (dart:core-patch/integers.dart:26)
#1  div (file:///.../dart/examples/intro/catch_exception.dart:2:12)
#2  main (file:///.../dart/examples/intro/catch_exception.dart:10:14)
#3  _startIsolate.isolateStartHandler (dart:isolate-patch/isolate_patch.dart:216)
#4  _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:115)

still working