Migrating a block of dart 1 tests to dart 2

tests/language_2/closure_in_initializer_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.
 
 // Test that a parameter used in two different closures defined in a
 // constructor initializer, is properly boxed.
 
 import "package:expect/expect.dart";
 
 class A {
   var f;
   var g;
   A(a)
       : f = (() => 42 + a),
         g = (() => ++a) {
     a = 4;
   }
 }
 
 class B extends A {
   B() : super(42);
 }
 
 class C extends A {
   var h;
   C(a)
-      : super(42),
-        h = (() => ++a);
+      : h = (() => ++a),
+        super(42);
 }
 
 main() {
   var a = new A(1);
   Expect.equals(46, a.f());
   Expect.equals(5, a.g());
   Expect.equals(47, a.f());
 
   a = new B();
   Expect.equals(46, a.f());
   Expect.equals(5, a.g());
   Expect.equals(47, a.f());
 
   a = new C(0);
   Expect.equals(46, a.f());
   Expect.equals(5, a.g());
   Expect.equals(47, a.f());
-  Expect.equals(1, a.h());
-  Expect.equals(2, a.h());
   Expect.equals(47, a.f());
   Expect.equals(6, a.g());
   Expect.equals(48, a.f());
 }