Repeated prefixes and parser fixes.

dart/frog/leg/resolver.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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
 }
 
 class TreeElementMapping implements TreeElements {
@@ skipping 1145 matching lines @@
     Identifier prefix = node.receiver.asIdentifier();
     if (prefix === null) {
       error(node.receiver, MessageKind.NOT_A_PREFIX, [node.receiver]);
       return null;
     }
     Element element = context.lookup(prefix.source);
     if (element === null || element.kind !== ElementKind.PREFIX) {
       error(node.receiver, MessageKind.NOT_A_PREFIX, [node.receiver]);
       return null;
     }
-    var e = element.library.lookupLocalMember(node.selector.source);
+    var e = element.lookupLocalMember(node.selector.source);
     if (e === null || !e.impliesType()) {
       error(node.selector, MessageKind.CANNOT_RESOLVE_TYPE, [node.selector]);
       return null;
     }
     return e.computeType(compiler);
   }
 
   Link<Type> getOrCalculateAllSupertypes(ClassElement classElement,
                                          [Set<ClassElement> seen]) {
     Link<Type> allSupertypes = classElement.allSupertypes;
@@ skipping 293 matching lines @@
       }
       SourceString constructorName =
         Elements.constructConstructorName(cls.name, name.source);
       FunctionElement constructor = cls.lookupConstructor(constructorName);
       if (constructor === null) {
         error(name, MessageKind.CANNOT_FIND_CONSTRUCTOR, [name]);
       }
       e = constructor;
     } else if (e.kind === ElementKind.PREFIX) {
       PrefixElement prefix = e;
-      e = prefix.library.lookupLocalMember(name.source);
+      e = prefix.lookupLocalMember(name.source);
       if (e === null) {
         error(name, MessageKind.CANNOT_RESOLVE, [name]);
         // TODO(ahe): Return erroneous element.
       } else if (e.kind !== ElementKind.CLASS) {
         error(node, MessageKind.NOT_A_TYPE, [name]);
       }
     } else {
       internalError(node.receiver, 'unexpected element $e');
     }
     return e;
@@ skipping 67 matching lines @@
 class TopScope extends Scope {
   LibraryElement get library() => element;
 
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) => library.find(name);
 
   Element add(Element element) {
     throw "Cannot add an element in the top scope";
   }
 }