From c9b13090252d9a12ed525d55e327bf0785534ee8 Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Fri, 16 Jan 2015 21:33:53 -0800
Subject: [PATCH] Gracefully handel getChangeRange in Scriptsnapshot.fromString

---
 src/services/services.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/services/services.ts b/src/services/services.ts
index 5dbea510779..69d11f1ded9 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -115,7 +115,9 @@ module ts {
             }
 
             public getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange {
-                throw new Error("not yet implemented");
+                // Text-based snapshots do not support incremental parsing. Return undefined
+                // to signal that to the caller.
+                return undefined;
             }
         }