Fix test that contains compile-time error.

tests/language/compile_time_constant10_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.
 
 import "package:expect/expect.dart";
 
 // Test that 'identical(a,b)' is a compile-time constant.
 
 class C {
   final x;
@@ skipping 16 matching lines @@
 const m2 = const {"x": 2};
 const c1 = const C(1);
 const c2 = const C(2);
 f1(){}
 f2(){}
 const id = identical;
 
 class CT {
   final x1;
   final x2;
-  bool id;
+  final bool id;
   const CT(var x1, var x2)
       : this.x1 = x1, this.x2 = x2, this.id = identical(x1, x2);
   void test(void expect(a,b), name) {
     expect(id, "$name: identical($x1,$x2)");
   }
 }
 
 const trueTests = const [
   const CT(2 - 1, i1),
   const CT(1 + 1, i2),
@@ skipping 52 matching lines @@
     trueTests[i].test(Expect.isTrue, "true[$i]");
   }
   for (int i = 0; i < falseTests.length; i++) {
     falseTests[i].test(Expect.isFalse, "false[$i]");
   }
 
   var x = idtest;  /// 01: continued
   var x = T.idtest2;  /// 02: continued
 }