Free the C memory for ArchiveInputStream when the stream is garbage collected.

utils/tests/archive/utils_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.
+
+#library('utils_test');
+
+#import('../../../lib/unittest/unittest.dart');
+#import('../../archive/utils.dart');
+
+main() {
+  group('attachFinalizer', () {
+    test('calls the finalizer eventually once the object is collected', () {
+      var finalized = null;
+
+      void finalizer(String data) {
+        finalized = data;
+      }
+
+      while (finalized == null) {
+        var list = [1, 2, 3];
+        attachFinalizer(list, finalizer, 'finally finalized!');
+      }
+
+      expect(finalized, equals('finally finalized!'));
+    });
+
+    test("doesn't call the finalizer while the object is in scope", () {
+      var finalized = null;
+
+      void finalizer(String data) {
+        finalized = data;
+      }
+
+      var list = [1, 2, 3];
+      attachFinalizer(list, finalizer, 'finally finalized!');
+      expect(finalized, isNull);
+    });
+  });
+}