Change the return value of setField to be in line with non-reflective assignments. Complete unwrapp…

runtime/tests/vm/dart/isolate_mirror_local_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 checking implemention of MirrorSystem when
 // inspecting the current isolate.
 //
 // VMOptions=--enable_type_checks
 
 library isolate_mirror_local_test;
@@ skipping 465 matching lines @@
 
 void testMirrorErrors(MirrorSystem mirrors) {
   LibraryMirror lib_mirror = mirrors.isolate.rootLibrary;
 
   lib_mirror.invokeAsync(const Symbol('methodWithException'), [])
     .then((InstanceMirror retval) {
       // Should not reach here.
       Expect.isTrue(false);
     })
     .catchError((error) {
-        Expect.isTrue(error is MirroredUncaughtExceptionError);
-        Expect.equals(const Symbol('MyException'),
-                      error.exception_mirror.type.simpleName);
+        Expect.isTrue(error is MyException);
         Expect.equals('MyException: from methodWithException',
-                      error.exception_string);
-        Expect.isTrue(error.stacktrace.toString().contains(
-            'isolate_mirror_local_test.dart'));
+                      error.toString());
         testDone('testMirrorErrors1');
       });
 
   lib_mirror.invokeAsync(const Symbol('methodWithError'), [])
     .then((InstanceMirror retval) {
       // Should not reach here.
       Expect.isTrue(false);
     })
     .catchError((error) {
       Expect.isTrue(error is MirroredCompilationError);
@@ skipping 36 matching lines @@
   // Test that an isolate can reflect on itself.
   mirrorSystemOf(exit_port.toSendPort()).then(testMirrorSystem);
 
   testIntegerInstanceMirror(reflect(1001));
   testStringInstanceMirror(reflect('This\nis\na\nString'));
   testBoolInstanceMirror(reflect(true));
   testNullInstanceMirror(reflect(null));
   testCustomInstanceMirror(reflect(new MyClass(17)));
   testMirrorErrors(currentMirrorSystem());
 }