diff -r bd87114ce341 -r 2da51e292734 mercurial/revlog.py
--- a/mercurial/revlog.py	Sat Nov 09 13:23:51 2019 +0100
+++ b/mercurial/revlog.py	Sat Nov 09 13:23:51 2019 +0100
@@ -687,7 +687,7 @@
 
     def rev(self, node):
         try:
-            return self.index.nodemap[node]
+            return self.index.rev(node)
         except TypeError:
             raise
         except error.RevlogError: