From 912a586d15daaa9daf4c4831dc5cc9022acc2b62 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Mon, 29 Dec 2014 22:51:55 -0500
Subject: [PATCH] Preserve backtrace for download errors

---
 Library/Homebrew/exceptions.rb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 949eee233c..a6a3380bb1 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -198,11 +198,12 @@ end
 
 # Raised in Resource.fetch
 class DownloadError < RuntimeError
-  def initialize(resource, e)
+  def initialize(resource, cause)
     super <<-EOS.undent
       Failed to download resource #{resource.download_name.inspect}
-      #{e.message}
+      #{cause.message}
       EOS
+    set_backtrace(cause.backtrace)
   end
 end