--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-revisions.t	Wed Mar 28 09:36:02 2018 -0700
@@ -0,0 +1,37 @@
+  $ hg init repo
+  $ cd repo
+
+  $ echo 0 > a
+  $ hg ci -qAm 0
+  $ for i in 5 8 14 43; do
+  >   hg up -q 0
+  >   echo $i > a
+  >   hg ci -qm $i
+  > done
+  $ cat <<EOF >> .hg/hgrc
+  > [alias]
+  > l = log -T '{rev}:{shortest(node,1)}\n'
+  > EOF
+
+  $ hg l
+  4:7ba5d
+  3:7ba57
+  2:72
+  1:9
+  0:b
+  $ cat <<EOF >> .hg/hgrc
+  > [experimental]
+  > revisions.disambiguatewithin=:3
+  > EOF
+9 was unambiguous and still is
+  $ hg l -r 9
+  1:9
+7 was ambiguous and still is
+  $ hg l -r 7
+  abort: 00changelog.i@7: ambiguous identifier!
+  [255]
+7b is no longer ambiguous
+  $ hg l -r 7b
+  3:7ba57
+
+  $ cd ..