Getters should not have parameters.

pkg/analysis_server/lib/src/protocol_server.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 protocol.server;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart' as
     engine;
 import 'package:analyzer/src/generated/ast.dart' as engine;
@@ skipping 208 matching lines @@
  */
 Location newLocation_fromUnit(engine.CompilationUnit unit,
     engine.SourceRange range) {
   engine.CompilationUnitElement unitElement = unit.element;
   engine.AnalysisContext context = unitElement.context;
   engine.Source source = unitElement.source;
   return _locationForArgs(context, source, range);
 }
 
 
-NavigationTarget newNavigationTarget_fromElement(engine.Element element,
-    int fileToIndex(String file)) {
+NavigationTarget newNavigationTarget_fromElement(engine.Element element, int
+    fileToIndex(String file)) {
   ElementKind kind = newElementKind_fromEngine(element.kind);
   Location location = newLocation_fromElement(element);
   String file = location.file;
   int fileIndex = fileToIndex(file);
   return new NavigationTarget(
       kind,
       fileIndex,
       location.offset,
       location.length,
       location.startLine,
@@ skipping 70 matching lines @@
       element = element.enclosingElement;
     }
   }
   return path;
 }
 
 
 String _getParametersString(engine.Element element) {
   // TODO(scheglov) expose the corresponding feature from ExecutableElement
   if (element is engine.ExecutableElement) {
-    var sb = new StringBuffer();
+    // valid getters don't have parameters
+    if (element.kind == engine.ElementKind.GETTER &&
+        element.parameters.isEmpty) {
+      return null;
+    }
+    // append parameters
+    StringBuffer sb = new StringBuffer();
     String closeOptionalString = '';
-    for (var parameter in element.parameters) {
+    for (engine.ParameterElement parameter in element.parameters) {
       if (sb.isNotEmpty) {
         sb.write(', ');
       }
       if (closeOptionalString.isEmpty) {
         if (parameter.kind == engine.ParameterKind.NAMED) {
           sb.write('{');
           closeOptionalString = '}';
         }
         if (parameter.kind == engine.ParameterKind.POSITIONAL) {
           sb.write('[');
@@ skipping 82 matching lines @@
       startColumn = offsetLocation.columnNumber;
     }
   }
   return new Location(
       source.fullName,
       range.offset,
       range.length,
       startLine,
       startColumn);
 }