Allow closures inside lazy initializers.

tests/language/lazy_static6_src.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.
+
+/*
+ * A lot of comments to make sure that the lazy initialization code has a
+ * position that does not fit into lazy_static6_test.dart file.
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ ******************************************************************************
+ */
+
+final x = (t) => (u) => t + u;
+
+main() {
+  Expect.equals(499, x(498)(1));
+  Expect.equals(42, x(39)(3));
+}