dart2js.

runtime/lib/isolate_patch.dart

Index: runtime/lib/isolate_patch.dart
diff --git a/runtime/lib/isolate_patch.dart b/runtime/lib/isolate_patch.dart
index e82050fd0f075ee78be4174fe825de062b264d62..88312681963135c57b400bb62b60e6c3e6bc1fec 100644
--- a/runtime/lib/isolate_patch.dart
+++ b/runtime/lib/isolate_patch.dart
@@ -40,7 +40,10 @@ class _ReceivePortImpl extends Stream implements ReceivePort {
                             { Function onError,
                               void onDone(),
                               bool cancelOnError }) {
-    return _controller.stream.listen(onData);
+    return _controller.stream.listen(onData,
+                                     onError: onError,
+                                     onDone: onDone,
+                                     cancelOnError: cancelOnError);
   }
 
   close() {
@@ -209,6 +212,15 @@ patch class Isolate {
       Uri uri, List<String> args, var message) {
     Completer completer = new Completer<Isolate>.sync();
     try {
+      if (args is List<String>) {
+        for (int i = 0; i < args.length; i++) {
+          if (args[i] is! String) {
+            throw new ArgumentError("Args must be a list of Strings $args");
+          }
+        }
+      } else if (args != null) {
+        throw new ArgumentError("Args must be a list of Strings $args");

[Lasse Reichstein Nielsen, 2013/10/25 14:28:24]

If we allow null, will it be null at the other end too, or an empty list?

[floitsch, 2013/10/25 14:33:14]

I would say `null`.

+      }
       // The VM will invoke [_startIsolate] and not `main`.
       SendPort controlPort = _spawnUri(uri.path);
       RawReceivePort readyPort = new RawReceivePort();