diff -r 034a422aeaff -r 8a5ee6aa8870 mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py	Sun Apr 01 22:40:15 2018 +0900
+++ b/mercurial/hgweb/hgwebdir_mod.py	Sun Apr 01 22:41:49 2018 +0900
@@ -172,7 +172,7 @@
                    'description_sort': "",
                    'lastchange': d,
                    'lastchange_sort': d[1] - d[0],
-                   'archives': [],
+                   'archives': templateutil.mappinglist([]),
                    'isdirectory': True,
                    'labels': templateutil.hybridlist([], name='label'),
                    }