Support new getter syntax.

dart/lib/compiler/implementation/resolver.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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   Type getType(TypeAnnotation annotation);
 }
 
@@ skipping 974 matching lines @@
       useElement(annotation, type.element);
     }
     return type;
   }
 
   void setupFunction(FunctionExpression node, FunctionElement function) {
     scope = new MethodScope(scope, function);
     // Put the parameters in scope.
     FunctionSignature functionParameters =
         function.computeSignature(compiler);
-    Link<Node> parameterNodes = node.parameters.nodes;
+    Link<Node> parameterNodes = (node.parameters === null)
+        ? const EmptyLink<Node>() : node.parameters.nodes;
     functionParameters.forEachParameter((Element element) {
       if (element == functionParameters.optionalParameters.head) {
         NodeList nodes = parameterNodes.head;
         parameterNodes = nodes.nodes;
       }
       VariableDefinitions variableDefinitions = parameterNodes.head;
       Node parameterNode = variableDefinitions.definitions.nodes.head;
       initializerDo(parameterNode, (n) => n.accept(this));
       // Field parameters (this.x) are not visible inside the constructor. The
       // fields they reference are visible, but must be resolved independently.
@@ skipping 1241 matching lines @@
   }
 
   /**
    * Resolves formal parameters and return type to a [FunctionSignature].
    */
   static FunctionSignature analyze(Compiler compiler,
                                    NodeList formalParameters,
                                    Node returnNode,
                                    Element element) {
     SignatureResolver visitor = new SignatureResolver(compiler, element);
-    LinkBuilder<Element> parametersBuilder =
+    Link<Element> parameters = const EmptyLink<Element>();
+    int requiredParameterCount = 0;
+    if (formalParameters === null) {
+      if (!element.isGetter()) {
+        compiler.reportMessage(compiler.spanFromElement(element),
+                               MessageKind.MISSING_FORMALS.error([]),
+                               api.Diagnostic.ERROR);
+      }
+    } else {
+      if (element.isGetter()) {
+        if (!element.getLibrary().isPlatformLibrary) {
+          // TODO(ahe): Remove the isPlatformLibrary check.
+          if (formalParameters.getEndToken().next.stringValue !== 'native') {
+            // TODO(ahe): Remove the check for native keyword.
+            compiler.reportMessage(compiler.spanFromNode(formalParameters),
+                                   MessageKind.EXTRA_FORMALS.error([]),
+                                   api.Diagnostic.WARNING);
+          }
+        }
+      }
+      LinkBuilder<Element> parametersBuilder =
         visitor.analyzeNodes(formalParameters.nodes);
-    Link<Element> parameters = parametersBuilder.toLink();
-    Type returnType =
-        compiler.resolveTypeAnnotation(element, returnNode);
+      requiredParameterCount  = parametersBuilder.length;
+      parameters = parametersBuilder.toLink();
+    }
+    Type returnType = compiler.resolveTypeAnnotation(element, returnNode);
     return new FunctionSignature(parameters,
                                  visitor.optionalParameters,
-                                 parametersBuilder.length,
+                                 requiredParameterCount,
                                  visitor.optionalParameterCount,
                                  returnType);
   }
 
   // TODO(ahe): This is temporary.
   void resolveExpression(Node node) {
     if (node == null) return;
     node.accept(new ResolverVisitor(compiler, enclosingElement));
   }
 
@@ skipping 197 matching lines @@
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) {
     return library.find(name);
   }
 
   Element add(Element newElement) {
     throw "Cannot add an element in the top scope";
   }
   String toString() => '$element';
 }