Change Link to List in FunctionSignature.

pkg/compiler/lib/src/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 {
   AnalyzableElement get analyzedElement;
   Iterable<Node> get superUses;
 
@@ skipping 2389 matching lines @@
     }
 
     scope = new MethodScope(scope, function);
     // Put the parameters in scope.
     FunctionSignature functionParameters = function.functionSignature;
     Link<Node> parameterNodes = (node.parameters == null)
         ? const Link<Node>() : node.parameters.nodes;
     functionParameters.forEachParameter((ParameterElement element) {
       // TODO(karlklose): should be a list of [FormalElement]s, but the actual
       // implementation uses [Element].
-      Link<Element> optionals = functionParameters.optionalParameters;
-      if (!optionals.isEmpty && element == optionals.head) {
+      List<Element> optionals = functionParameters.optionalParameters;
+      if (!optionals.isEmpty && element == optionals.first) {
         NodeList nodes = parameterNodes.head;
         parameterNodes = nodes.nodes;
       }
       visit(element.initializer);
       VariableDefinitions variableDefinitions = parameterNodes.head;
       Node parameterNode = variableDefinitions.definitions.nodes.head;
       // Field parameters (this.x) are not visible inside the constructor. The
       // fields they reference are visible, but must be resolved independently.
       if (element.isInitializingFormal) {
         registry.useElement(parameterNode, element);
@@ skipping 2739 matching lines @@
 }
 
 /// The result for the resolution of the `assert` method.
 class AssertResult implements ResolutionResult {
   const AssertResult();
 
   Element get element => null;
 
   String toString() => 'AssertResult()';
 }