Make unresolved access to top-level member a dynamic error.

lib/compiler/implementation/resolution/members.dart

 // 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.
 
 abstract class TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   DartType getType(Node node);
   bool isParameterChecked(Element element);
 }
@@ skipping 1539 matching lines @@
         return warnAndCreateErroneousElement(node, name,
                                              MessageKind.METHOD_NOT_FOUND,
                                              [receiverClass.name, name]);
       } else if (target.isInstanceMember()) {
         error(node, MessageKind.MEMBER_NOT_STATIC, [receiverClass.name, name]);
       }
     } else if (identical(resolvedReceiver.kind, ElementKind.PREFIX)) {
       PrefixElement prefix = resolvedReceiver;
       target = prefix.lookupLocalMember(name);
       if (target == null) {
-        error(node, MessageKind.NO_SUCH_LIBRARY_MEMBER, [prefix.name, name]);
+        return warnAndCreateErroneousElement(
+            node, name, MessageKind.NO_SUCH_LIBRARY_MEMBER,
+            [prefix.name, name]);
       }
     }
     return target;
   }
 
   DartType resolveTypeTest(Node argument) {
     TypeAnnotation node = argument.asTypeAnnotation();
     if (node == null) {
       // node is of the form !Type.
       node = argument.asSend().receiver.asTypeAnnotation();
@@ skipping 1393 matching lines @@
       error(node, MessageKind.CANNOT_INSTANTIATE_TYPEDEF, [name]);
     } else if (identical(e.kind, ElementKind.TYPE_VARIABLE)) {
       error(node, MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE, [name]);
     } else if (!identical(e.kind, ElementKind.CLASS)
         && !identical(e.kind, ElementKind.PREFIX)) {
       error(node, MessageKind.NOT_A_TYPE, [name]);
     }
     return e;
   }
 }