Allow binary operators on compile-time-constants.

frog/tests/leg_only/src/CompileTimeConstant5Test.dart

Index: frog/tests/leg_only/src/CompileTimeConstant5Test.dart
diff --git a/frog/tests/leg_only/src/CompileTimeConstant5Test.dart b/frog/tests/leg_only/src/CompileTimeConstant5Test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f5cfc4db2e88867dbd1cb5371858f5607f200016
--- /dev/null
+++ b/frog/tests/leg_only/src/CompileTimeConstant5Test.dart
@@ -0,0 +1,12 @@
+// 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.
+
+final x = true;
+final g1 = !true;
+final g2 = !g1;
+
+main() {
+  Expect.equals(false, g1);
+  Expect.equals(true, g2);
+}