Constrain type annotations with deferred types.

tests/language/deferred_constraints_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';
+
+@lazy import "deferred_constraints_lib.dart" as lib;
+import "deferred_constraints_lib.dart" as lib2; /// type_annotation_non_deferred: ok
+
+const lazy = const DeferredLibrary('lib');
+
+class F {}
+class G2<T> {}
+
+void main() {
+  Expect.throws(() { /// type_annotation1: static type warning
+    lib.C a = new lib.C(); /// type_annotation1: continued
+  }, (e) => e is NoSuchMethodError); /// type_annotation1: continued
+  lib.C a = null; /// type_annotation_null: static type warning
+
+  // In this case we do not defer C.
+  lib2.C a1 = new lib2.C(); /// type_annotation_non_deferred: continued
+  lazy.load().then((_) {
+    lib.C a2 = new lib.C(); /// type_annotation2: dynamic type error, static type warning
+    lib.G<F> a3 = new lib.G<F>(); /// type_annotation_generic1: dynamic type error, static type warning
+    G2<lib.C> a4 = new G2(); /// type_annotation_generic2: static type warning
+    G2<lib.C> a5 = new G2<lib.C>(); /// type_annotation_generic3: static type warning
+    lib.G<lib.C> a = new lib.G<lib.C>(); /// type_annotation_generic4: dynamic type error, static type warning
+    var a6 = new lib.C(); /// new: ok
+    var g1 = new lib.G<F>(); /// new_generic1: ok
+    // new G2<lib.C>() does not give a dynamic type error because a malformed
+    // type used as type-parameter is treated as dynamic.
+    var g2 = new G2<lib.C>(); /// new_generic2: static type warning
+    var g3 = new lib.G<lib.C>(); /// new_generic3: static type warning

[floitsch, 2014/03/06 15:25:02]

Not for this CL, but I think this is going to bite us.

+    var instance = lib.constantInstance;
+    Expect.throws(() { /// is_check: static type warning
+      bool a7 = instance is lib.Const; /// is_check: continued
+    }, (e) => e is TypeError); /// is_check: continued
+    Expect.throws(() { /// as_operation: static type warning
+      instance as lib.Const; /// as_operation: continued
+    }, (e) => e is TypeError); /// as_operation: continued
+    Expect.throws(() { /// catch_check: static type warning
+      try { throw instance; } on lib.Const {} /// catch_check: continued
+    }, (e) => e is TypeError); /// catch_check: continued
+    int i = lib.C.staticMethod(); /// static_method: ok
+  });
+}
+
+lib.C a9 = null; /// type_annotation_top_level: static type warning