From b040ea66d1f7b96029411c21781b094509f98cf6 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Thu, 11 Oct 2018 10:13:36 -0700
Subject: [PATCH] One more CR fix

---
 src/compiler/checker.ts | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index c2e8645518d..229a8bad77d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -12882,11 +12882,8 @@ namespace ts {
             if (propType) {
                 return propType;
             }
-            if (everyType(type, isTupleType)) {
-                const restType = mapType(type, t => getRestTypeOfTupleType(<TupleTypeReference>t) || undefinedType);
-                if (restType !== undefinedType) {
-                    return restType;
-                }
+            if (everyType(type, isTupleType) && !everyType(type, t => !(<TupleTypeReference>t).target.hasRestElement)) {
+                return mapType(type, t => getRestTypeOfTupleType(<TupleTypeReference>t) || undefinedType);
             }
             return undefined;
         }