diff -r 45f149bf08d1 -r df7b7d5033a5 mercurial/exchange.py
--- a/mercurial/exchange.py	Fri Mar 02 09:09:38 2018 -0500
+++ b/mercurial/exchange.py	Thu Mar 01 17:16:36 2018 -0800
@@ -283,7 +283,6 @@
 
     This function is used to allow testing of the older bundle version"""
     ui = op.repo.ui
-    forcebundle1 = False
     # The goal is this config is to allow developer to choose the bundle
     # version used during exchanged. This is especially handy during test.
     # Value is a list of bundle version to be picked from, highest version