Migrate test block 7 to Dart 2.0.

tests/corelib_strong/error_stack_trace_test.dart

-// Copyright (c) 2013, 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.
-
-import "package:expect/expect.dart";
-
-void argument() {
-  throw new ArgumentError(499);
-}
-
-void noSuchMethod() {
-  (499).doesNotExist();
-}
-
-void nullThrown() {
-  throw null;
-}
-
-void range() {
-  throw new RangeError.range(0, 1, 2);
-}
-
-void fallThrough() {
-  nested() {}
-
-  switch (5) {
-    case 5:
-      nested();
-    default:
-      Expect.fail("Should not reach");
-  }
-}
-
-abstract class A {
-  foo();
-}
-
-void abstractClassInstantiation() {
-  new A();
-}
-
-void unsupported() {
-  throw new UnsupportedError("unsupported");
-}
-
-void unimplemented() {
-  throw new UnimplementedError("unimplemented");
-}
-
-void state() {
-  return [1, 2].single;
-}
-
-void type() {
-  return 1 + "string";
-}
-
-main() {
-  List<Function> errorFunctions = [
-    argument,
-    noSuchMethod,
-    nullThrown,
-    range,
-    fallThrough,
-    abstractClassInstantiation,
-    unsupported,
-    unimplemented,
-    state,
-    type
-  ];
-
-  for (var f in errorFunctions) {
-    bool hasThrown = false;
-    try {
-      f();
-    } catch (e) {
-      hasThrown = true;
-      Expect.isTrue(
-          e.stackTrace is StackTrace, "$e doesn't have a non-null stack trace");
-    }
-    Expect.isTrue(hasThrown);
-  }
-}