diff -r 90a0f631829e -r bf176127033a mercurial/revlog.py
--- a/mercurial/revlog.py	Sat Nov 02 15:21:28 2019 +0100
+++ b/mercurial/revlog.py	Sat Nov 02 15:25:31 2019 +0100
@@ -661,7 +661,7 @@
 
     def rev(self, node):
         try:
-            return self._nodecache[node]
+            return self.index.nodemap[node]
         except TypeError:
             raise
         except error.RevlogError: