From 027f38176faf299aa95a1a0314b94e8e8c26bb09 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Wed, 13 Mar 2019 08:14:23 -0700
Subject: [PATCH] Fix regression in prepareContext() that caused "constructor"
 to be enumerable. [closes #747]

---
 src/util/prepare-context.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/util/prepare-context.js b/src/util/prepare-context.js
index 11f1b80bc..c27b2a1a9 100644
--- a/src/util/prepare-context.js
+++ b/src/util/prepare-context.js
@@ -144,21 +144,22 @@ function init() {
       }
 
       if (typeof RealmBuiltin === "function") {
+        setPrototypeOf(RealmBuiltin, getPrototypeOf(Builtin))
+
         if (has(RealmBuiltin, "prototype")) {
           const RealmProto = RealmBuiltin.prototype
 
           if (isObjectLike(RealmProto)) {
             const BuiltinProto = Builtin.prototype
 
+            setPrototypeOf(RealmProto, BuiltinProto)
+
             if (has(BuiltinProto, "constructor")) {
-              setProperty(RealmProto, "constructor", BuiltinProto.constructor)
+              Reflect.defineProperty(RealmProto, "constructor",
+                Reflect.getOwnPropertyDescriptor(BuiltinProto, "constructor"))
             }
-
-            setPrototypeOf(RealmProto, BuiltinProto)
           }
         }
-
-        setPrototypeOf(RealmBuiltin, getPrototypeOf(Builtin))
       }
     })