Version 0.4.7.3 .

editor/tools/plugins/com.google.dart.engine.services/src/com/google/dart/engine/services/completion/CompletionEngine.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 1051 matching lines @@
 
     @Override
     public Void visitConstructorName(ConstructorName node) {
       if (typeName == node.getType()) {
         if (node.getPeriod() != null) {
           if (isCompletionAfter(node.getPeriod().getEnd())) {
             // Is this branch reachable? Probably only in IdentifierCompleter.
             "".toString(); // TODO This currently is just a place-holder for a breakpoint.
           } else {
             // { new Cla!ss.cons() }
-            namedConstructorReference((ClassElement) identifier.getElement(), identifier);
+            Element element = identifier.getElement();
+            if (element instanceof ClassElement) {
+              namedConstructorReference((ClassElement) element, identifier);
+            }
           }
         } else {
           // { new ! } { new Na!me(); } { new js!on. }
           analyzeConstructorTypeName(identifier);
         }
       }
       return null;
     }
 
     @Override
@@ skipping 1103 matching lines @@
     ASTNode parent = node;
     while (parent != null) {
       if (parent instanceof ClassDeclaration) {
         return ((ClassDeclaration) parent).getElement().getType();
       }
       parent = parent.getParent();
     }
     return DynamicTypeImpl.getInstance();
   }
 }