From 80846e95f335fdef79e85fab8a6fa9fd189b392c Mon Sep 17 00:00:00 2001
From: Mike Gerwitz <mike@mikegerwitz.com>
Date: Fri, 18 Nov 2011 23:14:40 -0500
Subject: [PATCH] __proto__ => getPrototypeOf

---
 lib/util.js | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/lib/util.js b/lib/util.js
index 5f902a1..65dd9e1 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -457,6 +457,15 @@ exports.getOwnPropertyDescriptor =
     };
 
 
+/**
+ * Returns prototype of object, or undefined if unsupported
+ */
+exports.getPrototypeOf = Object.getPrototypeOf || function()
+{
+    return undefined;
+};
+
+
 /**
  * Travels down the prototype chain of the given object in search of the
  * requested property and returns its descriptor
@@ -483,14 +492,14 @@ exports.getPropertyDescriptor = function( obj, prop, nobase )
 
     // note that this uses util's function, not Object's
     var desc = exports.getOwnPropertyDescriptor( obj, prop ),
-        next = obj.__proto__;
+        next = exports.getPrototypeOf( obj );
 
     // if we didn't find a descriptor and a prototype is available, recurse down
     // the prototype chain, ensuring that the next prototype has a prototype if
     // the base is to be excluded
-    if ( !desc && next && ( !nobase || next.__proto__ ) )
+    if ( !desc && next && ( !nobase || exports.getPrototypeOf( next ) ) )
     {
-        return exports.getPropertyDescriptor( obj.__proto__, prop, nobase );
+        return exports.getPropertyDescriptor( next, prop, nobase );
     }
 
     // return the descriptor or undefined if no prototype is available
@@ -505,7 +514,7 @@ exports.getPropertyDescriptor = function( obj, prop, nobase )
  * @type  {boolean}
  */
 exports.defineSecureProp( exports.getPropertyDescriptor, 'canTraverse',
-    ( {}.__proto__ ) ? true : false
+    ( Object.getPrototypeOf ) ? true : false
 );