Constrain constant references from deferred libraries

tests/language/deferred_constraints_constants_test.dart

Index: tests/language/deferred_constraints_constants_test.dart
diff --git a/tests/language/deferred_constraints_constants_test.dart b/tests/language/deferred_constraints_constants_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..be446424d67a309b17d019136cb1bb6a95f15015
--- /dev/null
+++ b/tests/language/deferred_constraints_constants_test.dart
@@ -0,0 +1,63 @@
+// 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.
+
+import "dart:async";
+import 'package:expect/expect.dart';
+import 'package:async_helper/async_helper.dart';
+
+@lazy import "deferred_constraints_constants_lib.dart" as lib;
+
+const lazy = const DeferredLibrary('lib');
+
+const myConst1 =
+  lib.constantInstance; /// reference1: compile-time error
+  /*                    /// reference1: continued
+  499;
+  */                    /// reference1: continued
+const myConst2 =
+  lib.Const.instance; /// reference2: compile-time error
+  /*                  /// reference2: continued
+  499;
+  */                  /// reference2: continued
+
+void f1({a:
+  const lib.Const() /// default_argument1: compile-time error
+  /*                   /// default_argument1: continued
+  499
+  */                   /// default_argument1: continued
+}) {}
+
+void f2({a:
+  lib.constantInstance /// default_argument2: compile-time error
+  /*                         /// default_argument2: continued
+  499
+  */                         /// default_argument2: continued
+}) {}
+
+@lib.Const() /// metadata1: compile-time error
+class H1 {}
+@lib.Const.instance /// metadata2: compile-time error
+class H2 {}
+@lib.Const.namedConstructor() /// metadata3: compile-time error
+class H3 {}
+
+void main() {
+  var a1 = myConst1;
+  var a2 = myConst2;
+
+  asyncStart();
+  lazy.load().then((_) {
+    var instance = lib.constantInstance;
+    var c1 = const lib.Const(); /// constructor1: compile-time error
+    var c2 = const lib.Const.namedConstructor(); /// constructor2: compile-time error
+    f1();
+    f2();
+    var constInstance = lib.constantInstance; /// reference_after_load: ok
+    var h1 = new H1();
+    var h2 = new H2();
+    var h3 = new H3();
+    asyncEnd();
+  });
+}
+