From c47cdb8df88386710215bda03adbc7c4ee1e6e6e Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Thu, 8 Sep 2016 14:41:35 -0700
Subject: [PATCH] Enum literal is assignable to enum, even inside union

Previously, only number literals were assignable to enums inside unions.
---
 src/compiler/checker.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 1c42dbb7c26..80e1069f5c7 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6230,7 +6230,9 @@ namespace ts {
                 if (source.flags & (TypeFlags.Number | TypeFlags.NumberLiteral) &&
                     target.flags & TypeFlags.Union &&
                     forEach((target as UnionType).types, t => t.flags & TypeFlags.EnumLike)) return true;
-                if (source.flags & TypeFlags.NumberLiteral && target.flags & TypeFlags.EnumLiteral && (<LiteralType>source).text === (<LiteralType>target).text) return true;
+                if (source.flags & (TypeFlags.NumberLiteral | TypeFlags.EnumLiteral) &&
+                    target.flags & TypeFlags.EnumLiteral &&
+                    (<LiteralType>source).text === (<LiteralType>target).text) return true;
             }
             return false;
         }