Migrate language block 46 - canonical_const ... char_escape.

tests/language_2/cascade2_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.
 
 // Regression test for dart2js that used to hit an assertion in the
 // container tracer visitor in the presence of cascaded calls.
 
 import "package:expect/expect.dart";
 
 class A {
   var foo;
 
   add(list) {
     foo = list;
     list.add(2.5);
     return this;
   }
 
   call(arg) => arg;
 }
 
 main() {
-  var foo = [42, 0];
+  var foo = <dynamic>[42, 0];
   var a = new A();
   var bar = a..add(foo)('WHAT');
   a..foo[0] = new Object();
-  Expect.throws(() => foo[0] + 2, (e) => e is NoSuchMethodError);
+  Expect.throwsNoSuchMethodError(() => foo[0] + 2);
 }