diff --git a/src/harness/client.ts b/src/harness/client.ts
index ba2e920ac59..4f11c9d1a92 100644
--- a/src/harness/client.ts
+++ b/src/harness/client.ts
@@ -812,20 +812,20 @@ namespace ts.server {
             return notImplemented();
         }
 
-        toggleLineComment(): ts.TextChange[] {
-            throw new Error("Method not implemented.");
+        toggleLineComment(): TextChange[] {
+            return notImplemented();
         }
 
-        toggleMultilineComment(): ts.TextChange[] {
-            throw new Error("Method not implemented.");
+        toggleMultilineComment(): TextChange[] {
+            return notImplemented();
         }
 
-        commentSelection(): ts.TextChange[] {
-            throw new Error("Method not implemented.");
+        commentSelection(): TextChange[] {
+            return notImplemented();
         }
 
-        uncommentSelection(): ts.TextChange[] {
-            throw new Error("Method not implemented.");
+        uncommentSelection(): TextChange[] {
+            return notImplemented();
         }
 
         dispose(): void {
diff --git a/src/services/shims.ts b/src/services/shims.ts
index 15b0c1cb488..e3082b114e6 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -279,7 +279,7 @@ namespace ts {
         getEmitOutputObject(fileName: string): EmitOutput;
 
         toggleLineComment(fileName: string, textChange: TextRange): string;
-        toggleMultilineComment(fileName: string, textChange:TextRange): string;
+        toggleMultilineComment(fileName: string, textChange: TextRange): string;
         commentSelection(fileName: string, textChange: TextRange): string;
         uncommentSelection(fileName: string, textChange: TextRange): string;
     }