From 06c28ea69bf48ffd057f1a01f97bdeef3d76ff39 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 2 Feb 2018 07:48:21 -0800
Subject: [PATCH] Initialize more common properties in Symbol constructor

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

diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 2966582cb39..2b56a95b061 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -2772,6 +2772,10 @@ namespace ts {
         this.flags = flags;
         this.escapedName = name;
         this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
     }
 
     function Type(this: Type, checker: TypeChecker, flags: TypeFlags) {