From 85f37ecaa944d37bab81d7e24db138acfc4c6828 Mon Sep 17 00:00:00 2001
From: Anthony Scopatz <scopatz@gmail.com>
Date: Tue, 26 Jul 2016 12:40:20 -0400
Subject: [PATCH] some xexec optimizations

---
 xonsh/aliases.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xonsh/aliases.py b/xonsh/aliases.py
index 6e93876f7..56203e71c 100644
--- a/xonsh/aliases.py
+++ b/xonsh/aliases.py
@@ -282,9 +282,8 @@ def xexec(args, stdin=None):
     """Replaces current process with command specified and passes in the
     current xonsh environment.
     """
-    env = builtins.__xonsh_env__
-    denv = env.detype()
     if len(args) > 0:
+        denv = builtins.__xonsh_env__.detype()
         try:
             os.execvpe(args[0], args, denv)
         except FileNotFoundError as e: