Land 'Fix a crash related to obsolete factory syntax.'.

lib/compiler/implementation/scanner/class_element_parser.dart

 // Copyright (c) 2011, 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.
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
@@ skipping 81 matching lines @@
     Identifier receiver = send.receiver.asIdentifier();
     Identifier selector = send.selector.asIdentifier();
     Operator operator = selector.asOperator();
     if (operator !== null) {
       assert(receiver.source.stringValue === 'operator');
       // TODO(ahe): It is a hack to compare to ')', but it beats
       // parsing the node.
       bool isUnary = operator.token.next.next.stringValue === ')';
       return Elements.constructOperatorName(operator.source, isUnary);
     } else {
+      if (receiver == null) {
+        listener.cancel('library prefix in named factory constructor not '
+                        'implemented', node: send.receiver);
+      }
       return Elements.constructConstructorName(receiver.source,
                                                selector.source);
     }
   }
 
   void endMethod(Token getOrSet, Token beginToken, Token endToken) {
     super.endMethod(getOrSet, beginToken, endToken);
     FunctionExpression method = popNode();
     pushNode(null);
     bool isConstructor = isConstructorName(method.name);
@@ skipping 53 matching lines @@
   }
 
   void addMember(Element memberElement) {
     for (Link link = metadata; !link.isEmpty(); link = link.tail) {
       memberElement.addMetadata(link.head);
     }
     metadata = const Link<MetadataAnnotation>();
     enclosingElement.addMember(memberElement, listener);
   }
 }