--- a/mercurial/localrepo.py	Thu Nov 15 02:38:55 2018 +0100
+++ b/mercurial/localrepo.py	Thu Nov 15 02:46:31 2018 +0100
@@ -3012,6 +3012,7 @@
     hgvfs.makedir(notindexed=True)
     if 'sharedrepo' not in createopts:
         hgvfs.mkdir(b'cache')
+    hgvfs.mkdir(b'wcache')
 
     if b'store' in requirements and 'sharedrepo' not in createopts:
         hgvfs.mkdir(b'store')