Language/12_Expressions/08_Throw_A03_t04.dart

/*
 * Copyright (c) 2011, 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 Evaluation of a throw expression of the form throw e; proceeds as follows:
 * The expression e is evaluated yielding a value v. If v evaluates to null, then a
 * NullThrownError is thrown. Otherwise, control is transferred to the nearest
 * dynamically enclosing exception handler, with the current exception set to v.
 * @description Checks that attempting to throw null in any manner results in 
 * NullThrownError being thrown instead.
 * @author rodionov
 * @reviewer kaigorodov
 */
import "../../Utils/expect.dart";

n() {
  return null;
}

n2() {}

main() {
  try {
    throw null;
    Expect.fail("NullThrownError expected.");
  } on NullThrownError catch(ok) {}

  try {
    throw n();
    Expect.fail("NullThrownError expected.");
  } on NullThrownError catch(ok) {}

  try {
    throw n2();
    Expect.fail("NullThrownError expected.");
  } on NullThrownError catch(ok) {}

  try {
    throw (true ? null : null);
    Expect.fail("NullThrownError expected.");
  } on NullThrownError catch(ok) {}
}