From 323aa3a56c14d76c0ecd2d450572cd120269b41d Mon Sep 17 00:00:00 2001
From: Vladimir Matveev <vladima@microsoft.com>
Date: Tue, 14 Mar 2017 17:17:16 -0700
Subject: [PATCH] add asserts for cases when containing list cannot be
 determined

---
 src/services/textChanges.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/services/textChanges.ts b/src/services/textChanges.ts
index bb310657b60..4dcb0867d9a 100644
--- a/src/services/textChanges.ts
+++ b/src/services/textChanges.ts
@@ -190,6 +190,7 @@ namespace ts.textChanges {
         public deleteNodeInList(sourceFile: SourceFile, node: Node) {
             const containingList = formatting.SmartIndenter.getContainingList(node, sourceFile);
             if (!containingList) {
+                Debug.fail("node is not a list element");
                 return this;
             }
             const index = containingList.indexOf(node);
@@ -260,6 +261,7 @@ namespace ts.textChanges {
         public insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node) {
             const containingList = formatting.SmartIndenter.getContainingList(after, sourceFile);
             if (!containingList) {
+                Debug.fail("node is not a list element");
                 return this;
             }
             const index = containingList.indexOf(after);