diff -r eb687c28a915 -r 33db69b6b58b mercurial/thirdparty/concurrent/__init__.py
--- a/mercurial/thirdparty/concurrent/__init__.py	Wed Apr 11 14:48:24 2018 -0700
+++ b/mercurial/thirdparty/concurrent/__init__.py	Mon Apr 09 12:19:37 2018 -0700
@@ -1,3 +0,0 @@
-from pkgutil import extend_path
-
-__path__ = extend_path(__path__, __name__)