diff -r 6f26417b71bb -r b10d145837bc mercurial/repository.py
--- a/mercurial/repository.py	Wed Sep 12 15:17:47 2018 -0700
+++ b/mercurial/repository.py	Wed Sep 12 15:59:26 2018 -0700
@@ -1234,12 +1234,6 @@
         This is actually a class attribute and is shared among all instances.
         """)
 
-    openerreqs = interfaceutil.Attribute(
-        """Set of requirements that are passed to the opener.
-
-        This is actually a class attribute and is shared among all instances.
-        """)
-
     supported = interfaceutil.Attribute(
         """Set of requirements that this repo is capable of opening.""")