Improve name generation for indexed expressions

pkg/analysis_server/test/abstract_context.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.
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/exception/exception.dart';
@@ skipping 50 matching lines @@
 
 const Required required = const Required();
 
 class Required {
   final String reason;
   const Required([this.reason]);
 }
 ''');
 
   Source addPackageSource(String packageName, String filePath, String content) {
-    packageMap[packageName] = [(newFolder('/pubcache/$packageName'))];
-    File file = newFile('/pubcache/$packageName/$filePath', content);
+    packageMap[packageName] = [(newFolder('/pubcache/$packageName/lib'))];
+    File file = newFile('/pubcache/$packageName/lib/$filePath', content);
     return file.createSource();
   }
 
   Source addSource(String path, String content, [Uri uri]) {
     if (path.startsWith('/')) {
       path = provider.convertPath(path);
     }
     File file = newFile(path, content);
     Source source = file.createSource(uri);
     driver.addFile(path);
@@ skipping 80 matching lines @@
  * [engine.GeneralizingElementVisitor].
  */
 class _ElementVisitorFunctionWrapper extends GeneralizingElementVisitor {
   final _ElementVisitorFunction function;
   _ElementVisitorFunctionWrapper(this.function);
   visitElement(Element element) {
     function(element);
     super.visitElement(element);
   }
 }