From 8cde1fdcddffe4efd719113f7794b7d7a1c82d31 Mon Sep 17 00:00:00 2001
From: Roman Shtylman <shtylman@gmail.com>
Date: Sat, 28 Dec 2013 21:38:32 -0500
Subject: [PATCH] provide stack traces for browsers which don't have
 captureStackTrace

---
 assert.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/assert.js b/assert.js
index 97cd8db..40a3a85 100644
--- a/assert.js
+++ b/assert.js
@@ -58,6 +58,23 @@ assert.AssertionError = function AssertionError(options) {
   if (Error.captureStackTrace) {
     Error.captureStackTrace(this, stackStartFunction);
   }
+  else {
+    // non v8 browsers so we can have a stacktrace
+    var err = new Error();
+    if (err.stack) {
+      var out = err.stack;
+
+      // try to strip useless frames
+      var fn_name = stackStartFunction.name;
+      var idx = out.indexOf('\n' + fn_name);
+      if (idx >= 0) {
+        idx = out.indexOf('\n', idx + 1);
+        out = out.substring(idx + 1);
+      }
+
+      this.stack = out;
+    }
+  }
 };
 
 // assert.AssertionError instanceof Error