From e8bba5006f8e389ab2852225c297873a7939eca8 Mon Sep 17 00:00:00 2001
From: Hank Duan <duan.hank@gmail.com>
Date: Mon, 16 Jun 2014 14:36:28 -0700
Subject: [PATCH] fix(protractor): throw index-out-of-bounds

See https://github.com/angular/protractor/issues/915
- to make error more specific instead of propagate later
---
 lib/protractor.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/protractor.js b/lib/protractor.js
index 66c2d9a0e..f43dbf2a0 100644
--- a/lib/protractor.js
+++ b/lib/protractor.js
@@ -584,6 +584,12 @@ var buildElementHelper = function(ptor) {
         // -1 is special and means last
         index = arr.length - 1;
       }
+
+      if (index >= arr.length) {
+        throw new Error('Index out of bound. Trying to access index:' + index + 
+            ', but locator: ' + locatorMessage + ' only has ' + 
+            arr.length + ' elements');
+      }
       return arr[index];
     });
     return new webdriver.WebElement(ptor.driver, id);