From 84ef5afc24432e709c5a4be54b495584c6bdeb4e Mon Sep 17 00:00:00 2001
From: Steve Orvell <steve@orvellia.com>
Date: Tue, 25 Mar 2014 17:42:32 -0700
Subject: [PATCH] Fixes https://github.com/Polymer/polymer-dev/issues/20

---
 src/instance/base.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/instance/base.js b/src/instance/base.js
index 517f436..a224870 100644
--- a/src/instance/base.js
+++ b/src/instance/base.js
@@ -24,6 +24,10 @@
     ready: function() {
     },
     createdCallback: function() {
+      if (this.templateInstance) {
+        console.warn(this.localName, 'was bound prior to upgrade and may ' +
+            'have incorrect bindings.');
+      }
       this.created();
       this.prepareElement();
     },