Compute ConstructorElement.returnType/type dynamically.

pkg/analyzer/lib/src/dart/element/builder.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.dart.element.builder;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 1282 matching lines @@
    * Creates the [ConstructorElement]s array with the single default constructor element.
    *
    * @param interfaceType the interface type for which to create a default constructor
    * @return the [ConstructorElement]s array with the single default constructor element
    */
   List<ConstructorElement> _createDefaultConstructors(
       ClassElementImpl definingClass) {
     ConstructorElementImpl constructor =
         new ConstructorElementImpl.forNode(null);
     constructor.synthetic = true;
-    constructor.returnType = definingClass.type;
     constructor.enclosingElement = definingClass;
-    constructor.type = new FunctionTypeImpl(constructor);
     return <ConstructorElement>[constructor];
   }
 
   /**
    * For each [Annotation] found in [annotations], create a new
    * [ElementAnnotation] object and set the [Annotation] to point to it.
    */
   List<ElementAnnotation> _createElementAnnotations(
       NodeList<Annotation> annotations) {
     if (annotations.isEmpty) {
@@ skipping 160 matching lines @@
     return null;
   }
 
   /**
    * Return the lexical identifiers associated with the given [identifiers].
    */
   static List<String> _getIdentifiers(NodeList<SimpleIdentifier> identifiers) {
     return identifiers.map((identifier) => identifier.name).toList();
   }
 }