[Atom] Issue 424. Fix for 'getNavigation' and index expressions.

pkg/analysis_server/test/analysis/notification_navigation_test.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 test.analysis.notification.navigation;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 759 matching lines @@
   operator []=(index, A value) {}
 }
 main() {
   var b = new B();
   b[0] // [];
   b[1] = 1; // []=;
   b[2] += 2;
 }
 ''');
     return prepareNavigation().then((_) {
+      assertHasOperatorRegion('[0', 1, '[](index)', 2);
       assertHasOperatorRegion('] // []', 1, '[](index)', 2);
+      assertHasOperatorRegion('[1', 1, '[]=(index,', 3);
       assertHasOperatorRegion('] = 1;', 1, '[]=(index,', 3);
+      assertHasOperatorRegion('[2', 1, '[]=(index,', 3);
       assertHasOperatorRegion('] += 2;', 1, '[]=(index,', 3);
       assertHasOperatorRegion('+= 2;', 2, '+(other)', 1);
     });
   }
 
   test_partOf() {
     var libCode = 'library lib; part "test.dart";';
     var libFile = addFile('$projectPath/bin/lib.dart', libCode);
     addTestFile('part of lib;');
     return prepareNavigation().then((_) {
@@ skipping 132 matching lines @@
   test_type_void() {
     addTestFile('''
 void main() {
 }
 ''');
     return prepareNavigation().then((_) {
       assertNoRegionAt('void');
     });
   }
 }