Recover from fatal parser errors.

dart/pkg/compiler/lib/src/resolution/members.dart

Index: dart/pkg/compiler/lib/src/resolution/members.dart
diff --git a/dart/pkg/compiler/lib/src/resolution/members.dart b/dart/pkg/compiler/lib/src/resolution/members.dart
index 74ec34ed69822593b30a10e80cef15ad78e02202..0210a4afda84bb058f3c2fe43ac3a2abb4993663 100644
--- a/dart/pkg/compiler/lib/src/resolution/members.dart
+++ b/dart/pkg/compiler/lib/src/resolution/members.dart
@@ -1873,10 +1873,13 @@ class TypeResolver {
           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});