diff -r e58e234096de -r 77b8588dd84e mercurial/exchange.py
--- a/mercurial/exchange.py	Sat Aug 08 15:48:17 2020 +0530
+++ b/mercurial/exchange.py	Sat Aug 08 16:24:12 2020 +0530
@@ -32,6 +32,7 @@
     phases,
     pushkey,
     pycompat,
+    requirements,
     scmutil,
     sslutil,
     streamclone,
@@ -39,7 +40,6 @@
     util,
     wireprototypes,
 )
-from .interfaces import repository
 from .utils import (
     hashutil,
     stringutil,
@@ -1068,7 +1068,7 @@
     cgpart = bundler.newpart(b'changegroup', data=cgstream)
     if cgversions:
         cgpart.addparam(b'version', version)
-    if repository.TREEMANIFEST_REQUIREMENT in pushop.repo.requirements:
+    if requirements.TREEMANIFEST_REQUIREMENT in pushop.repo.requirements:
         cgpart.addparam(b'treemanifest', b'1')
     if b'exp-sidedata-flag' in pushop.repo.requirements:
         cgpart.addparam(b'exp-sidedata', b'1')
@@ -1691,7 +1691,7 @@
         old_heads = unficl.heads()
         clstart = len(unficl)
         _pullbundle2(pullop)
-        if repository.NARROW_REQUIREMENT in repo.requirements:
+        if requirements.NARROW_REQUIREMENT in repo.requirements:
             # XXX narrow clones filter the heads on the server side during
             # XXX getbundle and result in partial replies as well.
             # XXX Disable pull bundles in this case as band aid to avoid
@@ -2557,7 +2557,7 @@
 
     part.addparam(b'nbchanges', b'%d' % len(outgoing.missing), mandatory=False)
 
-    if repository.TREEMANIFEST_REQUIREMENT in repo.requirements:
+    if requirements.TREEMANIFEST_REQUIREMENT in repo.requirements:
         part.addparam(b'treemanifest', b'1')
 
     if b'exp-sidedata-flag' in repo.requirements: