Introduces the new syntax for deferred loading

sdk/lib/_internal/compiler/implementation/resolution/members.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 resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Setlet<Node> get superUses;
 
@@ skipping 446 matching lines @@
           compiler.enqueuer.resolution.getCachedElements(element);
       if (elements != null) {
         // TODO(karlklose): Remove the check for [isConstructor]. [elememts]
         // should never be non-null, not even for constructors.
         assert(invariant(element, element.isConstructor(),
             message: 'Non-constructor element $element '
                      'has already been analyzed.'));
         return elements;
       }
       if (element.isSynthesized) {
-        Element target = element.targetConstructor;
-        // Ensure the signature of the synthesized element is
-        // resolved. This is the only place where the resolver is
-        // seeing this element.
-        element.computeSignature(compiler);
-        if (!target.isErroneous()) {
-          compiler.enqueuer.resolution.registerStaticUse(
-              element.targetConstructor);
+        if (isConstructor) {
+          Element target = element.targetConstructor;
+          // Ensure the signature of the synthesized element is
+          // resolved. This is the only place where the resolver is
+          // seeing this element.
+          element.computeSignature(compiler);
+          if (!target.isErroneous()) {
+            compiler.enqueuer.resolution.registerStaticUse(
+                element.targetConstructor);
+          }
+        } else {
+          assert(element.isDeferredLoaderGetter());
         }
         return _ensureTreeElements(element);
       }
       if (element.isPatched) {
         checkMatchingPatchSignatures(element, element.patch);
         element = element.patch;
       }
       return compiler.withCurrentElement(element, () {
         FunctionExpression tree = element.parseNode(compiler);
         if (tree.modifiers.isExternal()) {
@@ skipping 4201 matching lines @@
   TreeElements _treeElements;
 
   bool get hasTreeElements => _treeElements != null;
 
   TreeElements get treeElements {
     assert(invariant(this, _treeElements !=null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 }