--- a/contrib/all-revsets.txt	Fri Mar 01 05:56:18 2019 +0530
+++ b/contrib/all-revsets.txt	Thu Jan 24 09:03:15 2019 -0500
@@ -154,3 +154,6 @@
 roots(matching(tip, "author"))
 roots(matching(tip, "author")) and -10000:-1
 (-10000:-1) and roots(matching(tip, "author"))
+only(max(head()))
+only(max(head()), min(head()))
+only(max(head()), limit(head(), 1, 1))