diff -r 98f97eb20597 -r 414114a7c18f mercurial/__init__.py
--- a/mercurial/__init__.py	Tue Nov 28 05:50:45 2017 +0530
+++ b/mercurial/__init__.py	Thu Nov 30 22:43:03 2017 +0900
@@ -31,9 +31,6 @@
             # Only handle Mercurial-related modules.
             if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')):
                 return None
-            # selectors2 is already dual-version clean, don't try and mangle it
-            if fullname.startswith('mercurial.selectors2'):
-                return None
             # third-party packages are expected to be dual-version clean
             if fullname.startswith('mercurial.thirdparty'):
                 return None