First end-to-end capability in analyzer2dart.

sdk/lib/_internal/compiler/implementation/dart_backend/placeholder_collector.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 dart_backend;
 
 class LocalPlaceholder {
   final String identifier;
   final Set<Node> nodes;
   LocalPlaceholder(this.identifier) : nodes = new Set<Node>();
@@ skipping 322 matching lines @@
   void makeErasePrefixPlaceholder(Node node) {
     assert(node is Identifier || node is Send);
     prefixNodesToErase.add(node);
   }
 
   void makeElementPlaceholder(Node node, Element element) {
     assert(node != null);
     assert(element != null);
     LibraryElement library = element.library;
     if (identical(element, mainFunction)) return;
-    if (library.canonicalUri == Compiler.DART_CORE) return;
+    if (library.isDartCore) return;
 
     if (library.isPlatformLibrary && !element.isTopLevel) {
       return;
     }
     if (element.isGetter || element.isSetter) {
       element = (element as FunctionElement).abstractField;
     }
     elementNodes.putIfAbsent(element, () => new Set<Node>()).add(node);
   }
 
@@ skipping 338 matching lines @@
 
   visitBlock(Block node) {
     for (Node statement in node.statements.nodes) {
       if (statement is VariableDefinitions) {
         makeVarDeclarationTypePlaceholder(statement);
       }
     }
     node.visitChildren(this);
   }
 }