diff -r 638a241202a3 -r be3f33f5e232 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Thu Mar 15 21:49:33 2018 +0900
+++ b/mercurial/cmdutil.py	Thu Mar 15 21:52:47 2018 +0900
@@ -909,7 +909,7 @@
     tres = formatter.templateresources(repo.ui, repo)
     t = formatter.maketemplater(repo.ui, tmpl, defaults=templatekw.keywords,
                                 resources=tres)
-    mapping = {'ctx': ctx, 'revcache': {}}
+    mapping = {'ctx': ctx}
     if props:
         mapping.update(props)
     return t.renderdefault(mapping)