From 9065b501723fbd57a2baa9f1be0a938c85606fd6 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Mon, 28 Nov 2016 10:53:25 -0800
Subject: [PATCH] getRegularTypeOfLiteralType before exhaustive switch check

---
 src/compiler/checker.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 7101d0b3d61..719ba724f42 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -13850,7 +13850,7 @@ namespace ts {
             if (!switchTypes.length) {
                 return false;
             }
-            return eachTypeContainedIn(type, switchTypes);
+            return eachTypeContainedIn(mapType(type, getRegularTypeOfLiteralType), switchTypes);
         }
 
         function functionHasImplicitReturn(func: FunctionLikeDeclaration) {