Language/13_Statements/11_Try_A04_t01.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 An on-catch clause of the form on T catch (p1) s is equivalent to an on-
 * catch clause on T catch (p1, p2) s where p2 is an identiier that does not occur
 * anywhere else in the program.
 * @description Checks that a catch clause with an explicitly specified type T of the first
 * exception parameter does not match a thrown object if it's not null and its type is not a subtype of T. 
 * @author vasya
 * @reviewer rodionov
 * @reviewer iefremov
 */
import "../../Utils/expect.dart";

class A {}
class B extends A {}

main() {
  try {
    try {
      throw new A();
    } on B catch(ex) {
      Expect.fail("This clause shouldn't be executed");
    } on String catch(ex) {
      Expect.fail("This clause shouldn't be executed");
    } on int catch(ex) {
      Expect.fail("This clause shouldn't be executed");
    }
  } on A catch(ok) {}
}