From db2c67e67812a37c9dffb187a225785cf6511dce Mon Sep 17 00:00:00 2001
From: Caitlin Potter <caitpotter88@gmail.com>
Date: Wed, 26 Mar 2014 15:31:20 -0400
Subject: [PATCH] fix(dirtychecking): prevent long prototype chain lookups of
 object properties

This doesn't really make a lot of sense, and is probably not worth doing. It
also breaks tests, which will possibly be rectified after reviewing angular.dart
commit e12e5b52b7441436858628e7b9d9e98b6c9f518f.
---
 src/dirty_checking.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/dirty_checking.js b/src/dirty_checking.js
index 8ebcabc..5d4f2bf 100644
--- a/src/dirty_checking.js
+++ b/src/dirty_checking.js
@@ -334,6 +334,17 @@ class DirtyCheckingRecord extends ChangeRecord {
     }
     if (typeof obj === "object") {
       this._mode = _MODE_MAP_FIELD_;
+
+      if (obj && this._field !== null) {
+        var object = obj, field = this._field;
+        while (object && !object.hasOwnProperty(field)) {
+          object = Object.getPrototypeOf(object);
+        }
+        if (!object) {
+          throw new Error("property '" + field + "' not found in object");
+        }
+      }
+
       // _instanceMirror = null; --- Reflection needed?
     } else if (this._getter !== null) {
       this._mode = _MODE_GETTER_;