From 8dc1747db7aae381b29b7f5f9d48d711f2df5ef5 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Tue, 13 Dec 2016 13:52:58 -0800
Subject: [PATCH] Set symbol/flags only on (fresh) object spreads

If you spread any into an object, the type is any, which should not be
changed.
---
 src/compiler/checker.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 686efaa758..4c9780faa7 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -11638,8 +11638,11 @@ namespace ts {
                 if (propertiesArray.length > 0) {
                     spread = getSpreadType(spread, createObjectLiteralType(), /*isFromObjectLiteral*/ true);
                 }
-                spread.flags |= propagatedFlags;
-                spread.symbol = node.symbol;
+                if (spread.flags & TypeFlags.Object) {
+                    // only set the symbol and flags if this is a (fresh) object type
+                    spread.flags |= propagatedFlags;
+                    spread.symbol = node.symbol;
+                }
                 return spread;
             }