Fix look-ahead parsing code in the VM (fixes #29243).

tests/language/regress_29243_test.dart

Index: tests/language/regress_29243_test.dart
diff --git a/tests/language/regress_29243_test.dart b/tests/language/regress_29243_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..60b0cb7c4ec4a27480bcda0957654f4686fcc8aa
--- /dev/null
+++ b/tests/language/regress_29243_test.dart
@@ -0,0 +1,12 @@
+// Copyright (c) 2017, 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";
+
+int Function() x = () => 42;
+int Function(int Function()) y = (int Function() x) => x();
+List<int Function()> l = <int Function()>[()=>42, x];
+main() {
+  Expect.equals(42, y(l[1]));
+}