Send a closure to an isolate fails silently (dartC)

[DartBot]

This issue was originally filed by [email protected]

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What steps will reproduce the problem?
Run this code in try.dartlang.org:

class MyIsolate extends Isolate {
  void main() {
    this.port.receive((message, replyTo) {
      print("Message with received: ${message}");
    });
  }
}

void main() {
  var iso = new MyIsolate();
  var f = (a) { print(a); };
  
  iso.spawn().then((port) {
     port.send(f);
  });
}
Link: http://try.dartlang.org/s/krkd

What is the expected output? What do you see instead?
I was expecting an error/exception or the message Message with received: Object printed in the output section.

When running nothing visible happens. Changing the line
   port.send(f);
to
   port.send("Hello");
results in the message: Message with received: Hello in the out put section
link: http://try.dartlang.org/s/WcEd

What version of the product are you using? On what operating system?
trydart.

Please provide any additional information below.

[DartBot]

This comment was originally written by [email protected]

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Actually, even sending custom objects through the send method fails silently:

http://try.dartlang.org/s/OoMd

Kind regards,
Mikkel

[DartBot]

This comment was originally written by [email protected]

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Set owner to @floitschG.
Added Area-Library, Triaged labels.

[floitschG]

This is a bug in Dartboard. There is an exception thrown, but it is not intercepted by Dartboard.
When the program starts up the event-loop is wrapped into a try/catch. However the isolate code uses window.setTimeout for future iterations (to keep the UI responsive), and the second (and all future) iterations of the event-loop are not executed in Dartboard's try/catch anymore.

Example:
class Printer extends Isolate {
  main() {
    port.receive((message, replyTo) {
      else replyTo.send(message, null);
    });
  }
}

main() {
  new Printer().spawn().then((port) {
    port.call("bar").receive((msg, ignored) {
      throw "foo"; // <========== Is not caught by Dartboard.
    });
  });
}

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Removed the owner.
Removed Area-Library label.
Added Area-Dartboard label.

[dgrove]

At some point, we would like to create a next-generation Dartboard. In the meantime, dartboard has been deprecated.

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Added WontFix label.