From 323a195db9b07fd54fa888d744da1866f24a4b76 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Sun, 20 Mar 2016 12:30:54 -0700
Subject: [PATCH] Don't elaborate errors when trying to relate a primitive to a
 union.

---
 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 27b08397205..b7779fc9da0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5678,7 +5678,7 @@ namespace ts {
                         }
                     }
                     if (target.flags & TypeFlags.Union) {
-                        if (result = typeRelatedToSomeType(source, <UnionType>target, reportErrors)) {
+                        if (result = typeRelatedToSomeType(source, <UnionType>target, reportErrors && !(source.flags & TypeFlags.Primitive))) {
                             return result;
                         }
                     }