# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 2018-07-14 00:10:43
# Node ID 89d93dd1a22238cb1ac8462522c283f251f65fa9
# Parent  2cdb82e8fb44346cdf8e9a27377a64642d0b212f

store: assert the fncache have been loaded if dirty

This should catch fncache corruption as the one that existed in
`perffncachewrite`.

diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -449,6 +449,7 @@ class fncache(object):
 
     def write(self, tr):
         if self._dirty:
+            assert self.entries is not None
             tr.addbackup('fncache')
             fp = self.vfs('fncache', mode='wb', atomictemp=True)
             if self.entries: