From 99fd6dcb3e96c84f8746e0da9d0dbf17a00dbdc4 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sat, 21 May 2016 11:17:30 -0700
Subject: [PATCH] Fix subtype relationship for 'never' type

---
 src/compiler/checker.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 422e08eccd5..87fdfb0ef9f 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5859,7 +5859,7 @@ namespace ts {
                 }
 
                 if (!(target.flags & TypeFlags.Never)) {
-                    if (target.flags & TypeFlags.Any) return Ternary.True;
+                    if (target.flags & TypeFlags.Any || source.flags & TypeFlags.Never) return Ternary.True;
                     if (source.flags & TypeFlags.Undefined) {
                         if (!strictNullChecks || target.flags & (TypeFlags.Undefined | TypeFlags.Void) || source === emptyArrayElementType) return Ternary.True;
                     }
@@ -5874,7 +5874,7 @@ namespace ts {
                     }
                     if (source.flags & TypeFlags.StringLiteral && target === stringType) return Ternary.True;
                     if (relation === assignableRelation || relation === comparableRelation) {
-                        if (source.flags & (TypeFlags.Any | TypeFlags.Never)) return Ternary.True;
+                        if (source.flags & TypeFlags.Any) return Ternary.True;
                         if (source === numberType && target.flags & TypeFlags.Enum) return Ternary.True;
                     }
                     if (source.flags & TypeFlags.Boolean && target.flags & TypeFlags.Boolean) {