Make test of malformed types a dynamic type error.

sdk/lib/_internal/compiler/implementation/elements/elements.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.
 
 library elements;
 
 
 import '../tree/tree.dart';
 import '../util/util.dart';
 import '../resolution/resolution.dart';
@@ skipping 581 matching lines @@
     // A different target statement only happens if the body is itself
     // a break or continue for a different target. In that case, this
     // label is also always unused.
     return element == null || element.statement != body;
   }
 }
 
 abstract class ErroneousElement extends Element implements FunctionElement {
   MessageKind get messageKind;
   Map get messageArguments;
+  String get message;
 }
 
 /// An [Element] whose usage should cause a warning.
 abstract class WarnOnUseElement extends Element {
   /// The element whose usage cause a warning.
   Element get wrappedElement;
 
   /// Reports the attached warning and returns the wrapped element.
   /// [usageSpannable] is used to report messages on the reference of
   /// [wrappedElement].
@@ skipping 367 matching lines @@
   int get resolutionState;
   Token get beginToken;
   Token get endToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }