Fix for updating documentationComment for top-level variables.

pkg/analyzer/lib/src/generated/incremental_resolver.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 analyzer.src.generated.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 782 matching lines @@
     incrementalResolver._updateCache();
     incrementalResolver._updateElementNameOffsets();
     incrementalResolver._shiftEntryErrors();
     _updateEntry();
     // resolve references in the comment
     incrementalResolver._resolveReferences(newComment);
     // update 'documentationComment' of the parent element(s)
     {
       AstNode parent = newComment.parent;
       if (parent is AnnotatedNode) {
+        setElementDocumentationForVariables(VariableDeclarationList list) {
+          for (VariableDeclaration variable in list.variables) {
+            Element variableElement = variable.element;
+            if (variableElement is ElementImpl) {
+              setElementDocumentationComment(variableElement, parent);
+            }
+          }
+        }
         Element parentElement = ElementLocator.locate(newComment.parent);
         if (parentElement is ElementImpl) {
           setElementDocumentationComment(parentElement, parent);
-        } else if (parentElement == null && parent is FieldDeclaration) {
-          for (VariableDeclaration field in parent.fields.variables) {
-            Element fieldElement = field.element;
-            if (fieldElement is ElementImpl) {
-              setElementDocumentationComment(fieldElement, parent);
-            }
-          }
+        } else if (parent is FieldDeclaration) {
+          setElementDocumentationForVariables(parent.fields);
+        } else if (parent is TopLevelVariableDeclaration) {
+          setElementDocumentationForVariables(parent.variables);
         }
       }
     }
     // OK
     return true;
   }
 
   Token _scan(String code) {
     RecordingErrorListener errorListener = new RecordingErrorListener();
     CharSequenceReader reader = new CharSequenceReader(code);
@@ skipping 491 matching lines @@
   @override
   String toString() => name;
 }
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }