templater: load and expand aliases by template engine (API) (issue4842) Now template aliases are fully supported in log and formatter templates. As I said before, aliases are not expanded in map files. This avoids possible corruption of our stock styles and web templates. This behavior is undocumented since no map file nor [templates] section are documented at all. Later on, we might want to add [aliases] section to map files if it appears to be useful.

--- a/mercurial/help/config.txt	Sun Apr 03 13:23:40 2016 +0900
+++ b/mercurial/help/config.txt	Sun Mar 27 20:59:36 2016 +0900
@@ -1488,6 +1488,11 @@
 rewrite rules are then applied on the full (absolute) path. The rules
 are applied in definition order.
 
+``templatealias``
+-----------------
+
+Alias definitions for templates. See :hg:`help templates` for details.
+
 ``trusted``
 -----------