LibTest/isolate/Isolate/spawn_A02_t01.dart

// Copyright (c) 2011-2016, the Dart project authors.  Please see the AUTHORS
// file for details. All rights reserved. Use of this source code is governed
// by a BSD-style license that can be found in the LICENSE file.

/**
 * @assertion Future<Isolate> spawn(void entryPoint(message), message,
 * {bool paused: false, bool errorsAreFatal, SendPort onExit, SendPort onError})
 *
 *    The argument entryPoint specifies the entry point of the spawned isolate.
 * It must be a top-level function or a static method that takes one argument -
 * that is, one-parameter functions that can be compile-time constant function
 * values. It is not allowed to pass the value of function expressions or
 * an instance method extracted from an object.
 *
 *    The entry-point function is invoked with the initial message. Usually
 * the initial message contains a SendPort so that the spawner and spawnee can
 * communicate with each other.
 *  ...
 *    Returns a future that will complete with an Isolate instance if
 * the spawning succeeded. It will complete with an error otherwise.
 *
 * @description Checks that if entryPoint is a local function, then returned
 * Future instance completes with error
 *
 * @issue #15234
 * @author kaigorodov
 * @author a.semenov@unipro.ru
 */
import "dart:async";
import "dart:isolate";
import "../../../Utils/expect.dart";

main() {
  void localFunction(message) { }

  asyncStart();

  Future<Isolate> result = Isolate.spawn(localFunction, "hello");
  result.then(
      (v) {
        Expect.fail(" a closure spawned: $v)");
      },
      onError: (e) {
//        print("onError: $e");
        asyncEnd();
      }
  );
}