From b69652b137c280b16f7325b8dedd3bf029339f27 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Thu, 5 Oct 2017 09:01:39 -0700
Subject: [PATCH] Set symbol on union of spreads

Previously, it was only set on the top-level type, and only if that
top-level type was an object type. Now it uses `forEachType` to set the
symbol on every object type in the union as well, if `getSpreadType`
returns a union.
---
 src/compiler/checker.ts | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index fbe192c5629..d7585bd6e9a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -13917,13 +13917,15 @@ namespace ts {
                 if (propertiesArray.length > 0) {
                     spread = getSpreadType(spread, createObjectLiteralType());
                 }
-                if (spread.flags & TypeFlags.Object) {
-                    // only set the symbol and flags if this is a (fresh) object type
-                    spread.flags |= propagatedFlags;
-                    spread.flags |= TypeFlags.FreshLiteral;
-                    (spread as ObjectType).objectFlags |= ObjectFlags.ObjectLiteral;
-                    spread.symbol = node.symbol;
-                }
+                // only set the symbol and flags if this is a (fresh) object type
+                forEachType(spread, t => {
+                    if (t.flags & TypeFlags.Object) {
+                        t.flags |= propagatedFlags;
+                        t.flags |= TypeFlags.FreshLiteral;
+                        (t as ObjectType).objectFlags |= ObjectFlags.ObjectLiteral;
+                        t.symbol = node.symbol
+                    }
+                });
                 return spread;
             }