Add tests for indexing.

pkg/analyzer/lib/src/summary/idl.dart

 // Copyright (c) 2015, 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.
 
 /**
  * This file is an "idl" style description of the summary format.  It
  * contains abstract classes which declare the interface for reading data from
  * summaries.  It is parsed and transformed into code that implements the
  * summary format.
  *
@@ skipping 113 matching lines @@
   /**
    * If this is an instantiation of a generic type or generic executable, the
    * type arguments used to instantiate it.  Trailing type arguments of type
    * `dynamic` are omitted.
    */
   @Id(1)
   List<EntityRef> get typeArguments;
 }
 
 /**
+ * Enum used to indicate the kind of element in [PackageIndex].
+ */
+enum IndexElementKind {
+  /**
+   * The element itself.

[Paul Berry, 2016/02/26 19:02:05]

I'm confused.  How can the "kind" of an element be the element itself?  What is
this used for?

+   */
+  element,
+
+  /**
+   * The unnamed synthetic constructor a class element.
+   */
+  constructor,
+
+  /**
+   * The getter of a property introducing element.
+   */
+  getter,
+
+  /**
+   * The setter of a property introducing element.
+   */
+  setter
+}
+
+/**
  * Enum used to indicate the kind of index relation.
  */
 enum IndexRelationKind {
   /**
    * Left: class.
    *   Is extended by.
    * Right: other class declaration.
    */
   IS_EXTENDED_BY,
 
@@ skipping 286 matching lines @@
 
 /**
  * Index information about a package.
  */
 @TopLevel('Indx')
 abstract class PackageIndex extends base.SummaryClass {
   factory PackageIndex.fromBuffer(List<int> buffer) =>
       generated.readPackageIndex(buffer);
 
   /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the kind of the element.
+   */
+  @Id(6)
+  List<IndexElementKind> get elementKinds;
+
+  /**
    * Each item of this list corresponds to a unique library URI with an element
    * referenced in the [PackageIndex].  It is an index into [uris] list.
    */
   @Id(2)
   List<int> get elementLibraryUris;
 
   /**
    * Each item of this list corresponds to a unique referenced element.  It is
    * the offset of the element name relative to the beginning of the file.  The
    * list is sorted in ascending order, so that the client can quickly check
@@ skipping 1674 matching lines @@
    */
   @Id(11)
   int get visibleLength;
 
   /**
    * If a local variable, the beginning of the visible range; zero otherwise.
    */
   @Id(12)
   int get visibleOffset;
 }