diff -r 254f98326eef -r 067f2a95e32c mercurial/patch.py
--- a/mercurial/patch.py	Thu Mar 02 13:29:43 2017 +0100
+++ b/mercurial/patch.py	Thu Mar 02 13:29:59 2017 +0100
@@ -38,6 +38,7 @@
     scmutil,
     similar,
     util,
+    vfs as vfsmod,
 )
 stringio = util.stringio
 
@@ -449,7 +450,7 @@
 class fsbackend(abstractbackend):
     def __init__(self, ui, basedir):
         super(fsbackend, self).__init__(ui)
-        self.opener = scmutil.vfs(basedir)
+        self.opener = vfsmod.vfs(basedir)
 
     def _join(self, f):
         return os.path.join(self.opener.base, f)
@@ -560,7 +561,7 @@
         else:
             if self.opener is None:
                 root = tempfile.mkdtemp(prefix='hg-patch-')
-                self.opener = scmutil.vfs(root)
+                self.opener = vfsmod.vfs(root)
             # Avoid filename issues with these simple names
             fn = str(self.created)
             self.opener.write(fn, data)