Runtime support for the new parameter specification.

lib/compiler/implementation/elements/elements.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.
 
 #library('elements');
 
 #import('dart:uri');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
@@ skipping 829 matching lines @@
 
   AbstractFieldElement cloneTo(Element enclosing, DiagnosticListener listener) {
     listener.cancel("Cannot clone synthetic AbstractFieldElement",
                     element: this);
   }
 }
 
 // TODO(johnniwinther): [FunctionSignature] should be merged with
 // [FunctionType].
 class FunctionSignature {
-  Link<Element> requiredParameters;
-  Link<Element> optionalParameters;
-  DartType returnType;
-  int requiredParameterCount;
-  int optionalParameterCount;
+  final Link<Element> requiredParameters;
+  final Link<Element> optionalParameters;
+  final DartType returnType;
+  final int requiredParameterCount;
+  final int optionalParameterCount;
+  final bool optionalParametersAreNamed;
   FunctionSignature(this.requiredParameters,
                     this.optionalParameters,
                     this.requiredParameterCount,
                     this.optionalParameterCount,
+                    this.optionalParametersAreNamed,
                     this.returnType);
 
   void forEachRequiredParameter(void function(Element parameter)) {
     for (Link<Element> link = requiredParameters;
          !link.isEmpty();
          link = link.tail) {
       function(link.head);
     }
   }
 
@@ skipping 820 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }