Recover from fatal parser errors.

dart/pkg/compiler/lib/src/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.
 
 part of resolution;
 
 abstract class TreeElements {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 1855 matching lines @@
     // Try to construct the type from the element.
     if (element == null) {
       type = reportFailureAndCreateType(
           MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.typeName});
     } else if (element.isAmbiguous) {
       AmbiguousElement ambiguous = element;
       type = reportFailureAndCreateType(
           ambiguous.messageKind, ambiguous.messageArguments);
       ambiguous.diagnose(registry.mapping.analyzedElement, compiler);
     } else if (element.isErroneous) {
-      ErroneousElement erroneousElement = element;
-      type = reportFailureAndCreateType(
-          erroneousElement.messageKind, erroneousElement.messageArguments,
-          erroneousElement: erroneousElement);
+      if (element is ErroneousElement) {
+        type = reportFailureAndCreateType(
+            element.messageKind, element.messageArguments,
+            erroneousElement: element);
+      } else {
+        type = const DynamicType();
+      }
     } else if (!element.impliesType) {
       type = reportFailureAndCreateType(
           MessageKind.NOT_A_TYPE, {'node': node.typeName});
     } else {
       bool addTypeVariableBoundsCheck = false;
       if (element.isClass) {
         ClassElement cls = element;
         // TODO(johnniwinther): [_ensureClassWillBeResolved] should imply
         // [computeType].
         compiler.resolver._ensureClassWillBeResolved(cls);
@@ skipping 3125 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }