Future.chain: an exception is thrown if chained future receives an exception before the first future is completed.

[DartBot]

This issue was originally filed by ms...@unipro.ru

---

What steps will reproduce the problem?
Run the following test:

main() {
  Completer completer = new Completer();
  Future f = completer.future;

  Completer chainCompleter = new Completer();

  Future chained = f.chain((value) {
    return chainCompleter.future;
  });

  chainCompleter.completeException(1);
  completer.complete(0);
  print(chained.exception);
}

What is the expected output? What do you see instead?
From the documentation of method chain(): "If an exception occurs (received by this future, thrown by transformation, or received by the future returned by transformation) then the returned future will receive the exception.". So, that test should just print '1'. But when complete() is invoked on completer, exception 1 is thrown.

What version of the product are you using? On what operating system?
DartVM, Frog r4736. OS Ubuntu 10.04

Please provide any additional information below.

[kasperl]

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

[sigmundch]

Will fix shortly (https://chromiumcodereview.appspot.com/9533014/)

---

Added Accepted label.

[sigmundch]

Fixed in r4762

[sigmundch]

Added Fixed label.