diff -r 04a3ae7aba14 -r c86256bd4eb8 mercurial/manifest.py
--- a/mercurial/manifest.py	Wed Jan 29 13:39:50 2020 -0800
+++ b/mercurial/manifest.py	Wed Feb 05 15:01:22 2020 -0500
@@ -1921,9 +1921,6 @@
     def _storage(self):
         return self._manifestlog.getstorage(b'')
 
-    def new(self):
-        return memmanifestctx(self._manifestlog)
-
     def copy(self):
         memmf = memmanifestctx(self._manifestlog)
         memmf._manifestdict = self.read().copy()
@@ -1970,9 +1967,6 @@
     def node(self):
         return self._node
 
-    def new(self):
-        return memmanifestctx(self._manifestlog)
-
     def copy(self):
         memmf = memmanifestctx(self._manifestlog)
         memmf._manifestdict = self.read().copy()
@@ -2037,9 +2031,6 @@
     def _storage(self):
         return self._manifestlog.getstorage(b'')
 
-    def new(self, dir=b''):
-        return memtreemanifestctx(self._manifestlog, dir=dir)
-
     def copy(self):
         memmf = memtreemanifestctx(self._manifestlog, dir=self._dir)
         memmf._treemanifest = self._treemanifest.copy()
@@ -2122,9 +2113,6 @@
     def node(self):
         return self._node
 
-    def new(self, dir=b''):
-        return memtreemanifestctx(self._manifestlog, dir=dir)
-
     def copy(self):
         memmf = memtreemanifestctx(self._manifestlog, dir=self._dir)
         memmf._treemanifest = self.read().copy()