Migrate language block 46 - canonical_const ... char_escape.

tests/language_strong/cast_test.dart

-// Copyright (c) 2012, 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.
-// Dart test program for constructors and initializers.
-
-import "package:expect/expect.dart";
-
-// Test 'expression as Type' casts.
-
-class C {
-  final int foo = 42;
-}
-
-class D extends C {
-  final int bar = 37;
-}
-
-Object createC() => new C();
-Object createD() => new D();
-Object getNull() => null;
-Object createList() => <int>[2];
-Object createInt() => 87;
-Object createString() => "a string";
-
-main() {
-  Object oc = createC();
-  Object od = createD();
-  Object on = getNull();
-  Object ol = createList();
-  Object oi = createInt();
-  Object os = createString();
-
-  Expect.equals(42, (oc as C).foo);
-  Expect.equals(42, (od as C).foo);
-  Expect.equals(42, (od as D).foo);
-  Expect.equals(37, (od as D).bar);
-  Expect.equals(37, ((od as C) as D).bar);
-  (oc as D).foo; // //# 01: runtime error
-  (on as D).toString();
-  (on as D).foo; // //# 02: runtime error
-  (on as C).foo; // //# 03: runtime error
-  oc.foo; // //# 04: static type warning
-  od.foo; // //# 05: static type warning
-  (on as Object).toString();
-  (oc as Object).toString();
-  (od as Object).toString();
-  (on as dynamic).toString();
-  (on as dynamic).foo; // //# 07: runtime error
-  (oc as dynamic).foo;
-  (od as dynamic).foo;
-  (oc as dynamic).bar; // //# 08: runtime error
-  (od as dynamic).bar;
-  C c = oc as C;
-  c = od as C;
-  c = oc;
-  D d = od as D;
-  d = oc as D; // //# 10: runtime error
-  d = od;
-
-  (ol as List)[0];
-  (ol as List<int>)[0];
-  (ol as dynamic)[0];
-  (ol as String).length; // //# 12: runtime error
-  int x = (ol as List<int>)[0];
-  (ol as List<int>)[0] = (oi as int);
-
-  (os as String).length;
-  (os as dynamic).length;
-  (oi as String).length; // //# 13: runtime error
-  (os as List).length; // //# 14: runtime error
-
-  (oi as int) + 2;
-  (oi as List).length; // //# 15: runtime error
-}