Support constructor declarations in analyzer2dart.

pkg/compiler/lib/src/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 171 matching lines @@
       topmostEnclosingFunction, () => new FunctionScope());
 
   PlaceholderCollector(this.listener, this.mirrorRenamer,
                        this.fixedMemberNames, this.elementAsts,
                        this.mainFunction);
 
   void collectFunctionDeclarationPlaceholders(
       FunctionElement element, FunctionExpression node) {
     if (element.isConstructor) {
       ConstructorElement constructor = element;
-      DartType type = element.enclosingClass.thisType.asRaw();
       tryMakeConstructorPlaceholder(node.name, element);
       RedirectingFactoryBody bodyAsRedirectingFactoryBody =
           node.body.asRedirectingFactoryBody();
       if (bodyAsRedirectingFactoryBody != null) {
         // Factory redirection.
         FunctionElement redirectTarget = constructor.immediateRedirectionTarget;
         assert(redirectTarget != null && redirectTarget != element);
-        type = redirectTarget.enclosingClass.thisType.asRaw();
         tryMakeConstructorPlaceholder(
             bodyAsRedirectingFactoryBody.constructorReference,
             redirectTarget);
       }
     } else if (Elements.isStaticOrTopLevel(element)) {
       // Note: this code should only rename private identifiers for class'
       // fields/getters/setters/methods.  Top-level identifiers are renamed
       // just to escape conflicts and that should be enough as we shouldn't
       // be able to resolve private identifiers for other libraries.
       makeElementPlaceholder(node.name, element);
@@ skipping 491 matching lines @@
 
   visitBlock(Block node) {
     for (Node statement in node.statements.nodes) {
       if (statement is VariableDefinitions) {
         makeVarDeclarationTypePlaceholder(statement);
       }
     }
     node.visitChildren(this);
   }
 }