Fix test.

tests/language/const_constructor2_test.dart

 // Copyright (c) 2014, 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 issue 14348.
 
 class A<T> {
   const A();
 }
 
@@ skipping 23 matching lines @@
 }
 
 class F<V> implements E {
   final V field;
 
   const F(this.field);
   const factory F.redirecting(V field) = G<int>;
 }
 
 class G<W> implements F {
-  final field;
-  const G(W this.field);
+  final W field;
+  const G(field) : this.field = field;
 }
 
 main() {
   const A<int> a = const B<int>();
 
   const C c1 = const C(a); /// 01: ok
   const C c2 = const C.optional(a); /// 02: ok
   const C c3 = const C.named(a: a); /// 03: ok
   const C c4 = const C.untyped(a); /// 04: ok
   const C c5 = const C.subtyped(a); /// 05: ok
@@ skipping 13 matching lines @@
   const C c15 = const C<double>.subtyped(a); /// 17: static type warning, checked mode compile-time error
   const C c15m = const C<double>.redirecting(a); /// 18: static type warning
 
   const E e1 = const E.redirecting1(0); /// 19: ok
   const E e2 = const E.redirecting1(''); /// 20: checked mode compile-time error
   const E e3 = const E.redirecting2(0); /// 21: ok
   const E e4 = const E.redirecting2(''); /// 22: checked mode compile-time error
   const E e5 = const E.redirecting3(0); /// 23: ok
   const E e6 = const E.redirecting3(''); /// 24: checked mode compile-time error
 }