Fix for build and IDL formats.

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

Index: pkg/analyzer/lib/src/summary/format.dart
diff --git a/pkg/analyzer/lib/src/summary/format.dart b/pkg/analyzer/lib/src/summary/format.dart
index 38f4a9d7f0b41855ff959717192feaea674a58dc..a337fc4130abca1cfae507a12dc66dbc8017c2d3 100644
--- a/pkg/analyzer/lib/src/summary/format.dart
+++ b/pkg/analyzer/lib/src/summary/format.dart
@@ -1444,7 +1444,7 @@ class PackageIndexBuilder extends Object with _PackageIndexMixin implements idl.
 
   /**
    * Each item of this list corresponds to a unique referenced element.  It is
-   * the kind of the element.
+   * the kind of the synthetic element.
    */
   void set elementKinds(List<idl.IndexSyntheticElementKind> _value) {
     assert(!_finished);