Fix for parsing not closed comment reference.

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 86f181bdd028e116008c3d4226f0b517aacd0654..8d495afae6345dd3a21a0155b522e12c66b94cf9 100644
--- a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
+++ b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
@@ -1623,7 +1623,7 @@ f2() {
 ''');
   }
 
-  test_update_emptyCommentReference() {
+  test_update_commentReference_empty() {
     _buildOldUnit(r'''
 /// Empty [] reference.
 class A {}
@@ -1634,6 +1634,18 @@ class A {}
 ''');
   }
 
+  test_update_commentReference_notClosed() {
+    _buildOldUnit(r'''
+/// [c)
+class A {}
+''');
+    _buildNewUnit(r'''
+int a;
+/// [c)
+class A {}
+''');
+  }
+
   test_update_rewrittenConstructorName() {
     _buildOldUnit(r'''
 class A {