Constrain constant references from deferred libraries

tests/language/deferred_constraints_constants_test.dart

+// 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
+const myConst2 = lib.Const.instance; /// reference2: compile-time error
+
+void f1({a: const lib.Const()}) {} /// default_argument1: compile-time error

[floitsch, 2014/03/12 16:48:13]

Try to reduce the coverage of the "///". If this line was missing a parenthesis
you wouldn't see it.

void f1({
  a: const lib.Const(),  /// default_argument1: compile-time error
  b: 499
}) {}

or maybe even:

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
+
+@lib.Const() class H1 {} /// metadata1: compile-time error

[floitsch, 2014/03/12 16:48:13]

@lib.Const()  /// metadata1: compile-time error
class H1 {}


This way you can leave the new H1() below.

+@lib.Const.instance class H2 {} /// metadata2: compile-time error
+@lib.Const.namedConstructor() class H3 {} /// metadata3: compile-time error
+
+void main() {
+  var a1 = myConst1; /// reference1: continued
+  var a2 = myConst2; /// reference2: continued
+
+  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(); /// default_argument1: continued
+    f2(); /// default_argument2: continued
+    var constInstance = lib.constantInstance; /// reference_after_load: ok
+    var h1 = new H1(); /// metadata1: continued
+    var h2 = new H2(); /// metadata2: continued
+    var h3 = new H3(); /// metadata3: continued
+    asyncEnd();
+  });
+}
+