Token of an empty comment reference should end with EOF.

pkg/analyzer/test/src/task/incremental_element_builder_test.dart

Index: pkg/analyzer/test/src/task/incremental_element_builder_test.dart
diff --git a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
index 187f1befc6f688881fcc35cdd7f52da407c00877..7dfea591ec598ff187be7850e1ae9e690ac08a3b 100644
--- a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
+++ b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
@@ -1623,6 +1623,17 @@ f2() {
 ''');
   }
 
+  test_update_emptyCommentReference() {
+    _buildOldUnit(r'''
+/// Empty [] reference.
+class A {}
+''');
+    _buildNewUnit(r'''
+/// Empty [] reference.
+class A {}
+''');
+  }
+
   test_update_rewrittenConstructorName() {
     _buildOldUnit(r'''
 class A {