--- a/mercurial/repair.py	Mon Aug 12 13:22:27 2019 -0400
+++ b/mercurial/repair.py	Mon Aug 12 14:00:19 2019 -0400
@@ -392,9 +392,7 @@
 
     with repo.lock():
         fnc = repo.store.fncache
-        # Trigger load of fncache.
-        if 'irrelevant' in fnc:
-            pass
+        fnc.ensureloaded(warn=ui.warn)
 
         oldentries = set(fnc.entries)
         newentries = set()