From 45a4236fb039087445461b5aa6bcce644894d6c5 Mon Sep 17 00:00:00 2001
From: nwin <nwin@users.noreply.github.com>
Date: Sun, 23 Nov 2014 10:51:46 +0100
Subject: [PATCH] Fixes 4037. Enable backtrace on run cmd.

---
 python/servo/post_build_commands.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/python/servo/post_build_commands.py b/python/servo/post_build_commands.py
index 37a4c4e3c72..10ab699aca4 100644
--- a/python/servo/post_build_commands.py
+++ b/python/servo/post_build_commands.py
@@ -26,8 +26,10 @@ class MachCommands(CommandBase):
         'params', default=None, nargs='...',
         help="Command-line arguments to be passed through to Servo")
     def run(self, params):
+        env = self.build_env()
+        env["RUST_BACKTRACE"] = "1"
         subprocess.check_call([path.join("target", "servo")] + params,
-                              env=self.build_env())
+                              env=env)
 
     @Command('doc',
              description='Generate documentation',