Add test case to regress case where fields of a closure are accessed (reproduces the problem we enc…

tests/lib/mirrors/invocation_fuzz_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.
 
 // This test reflectively enumerates all the methods in the system and tries to
 // invoke them with various basic values (nulls, ints, etc). This may result in
 // Dart exceptions or hangs, but should never result in crashes or JavaScript
 // exceptions.
 
 library test.invoke_natives;
@@ skipping 78 matching lines @@
         () => target.setField(m.simpleName, null);
   } else if (m.isConstructor) {
     return;
   } else {
     throw "Unexpected method kind";
   }
 
   queue.add(task);
 }
 
+checkField(VariableMirror v, ObjectMirror target, [origin]) {
+  if (isBlacklisted(v.qualifiedName)) return;
+
+  var task = new Task();
+  task.name = '${MirrorSystem.getName(v.qualifiedName)} from $origin';
+
+  task.action = () => target.getField(v.simpleName);
+
+  queue.add(task);
+}
+
 checkInstance(instanceMirror, origin) {
   ClassMirror klass = instanceMirror.type;
   while (klass != null) {
     instanceMirror.type.declarations.values
         .where((d) => d is MethodMirror && !d.isStatic)
         .forEach((m) => checkMethod(m, instanceMirror, origin));
+    instanceMirror.type.declarations.values
+        .where((d) => d is VariableMirror)
+        .forEach((v) => checkField(v, instanceMirror, origin));
     klass = klass.superclass;
   }
 }
 
 checkClass(classMirror) {
   classMirror.declarations.values
       .where((d) => d is MethodMirror && d.isStatic)
       .forEach((m) => checkMethod(m, classMirror));
 
   classMirror.declarations.values
@@ skipping 55 matching lines @@
   fuzzArgument = false;  /// false: ok
   fuzzArgument = 'string';  /// string: ok
   fuzzArgument = new List(0);  /// emptyarray: ok
 
   print('Fuzzing with $fuzzArgument');
 
   currentMirrorSystem().libraries.values.forEach(checkLibrary);
 
   var valueObjects =
     [true, false, null, [], {}, dynamic,
-     0, 0xEFFFFFF, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 3.14159,
+     0, 0xEFFFFFF, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFF, 3.14159, () {},
      "foo", 'blåbærgrød', 'Îñţérñåţîöñåļîžåţîờñ', "\u{1D11E}", #symbol];
   valueObjects.forEach((v) => checkInstance(reflect(v), 'value object'));
 
   uncaughtErrorHandler(self, parent, zone, error, stack) {};
   var zoneSpec =
      new ZoneSpecification(handleUncaughtError: uncaughtErrorHandler);
   testZone = Zone.current.fork(specification: zoneSpec);
   testZone.createTimer(Duration.ZERO, doOneTask);
 }