serializing user-defined types over sendport fails in dartc

[DartBot]

This issue was originally filed by karl.k...@gmail.com

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This code runs in dart_bin but throws exception during serialization with dartc:

class Pair {
  final k1;
  final k2;
  Pair(this.k1,this.k2);
  int hashCode() => 7 + 13k1.hashCode() + 17k2.hashCode();
  bool operator ==(obj) => (obj is Pair) && obj.k1 == k1 && obj.k2 == k2;
}

class A extends Isolate {
  main() {
    this.port.receive((m, sp) {
        print(m);
      });
  }
}

main() {

  ReceivePort rp = new ReceivePort();
  new A().spawn().then((SendPort sp) {
      sp.send(new Pair(1,2),rp.toSendPort());
  });

}

[DartBot]

This comment was originally written by drfibonacci@google.com

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Added Area-Compiler, Triaged labels.

[DartBot]

This comment was originally written by zundel@google.com

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No more code generation with dartc

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Added WontFix label.

[DartBot]

This comment was originally written by groeber...@google.com

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Why WontFix?