help: new revsets topic
Based on a patch by timeless which in turn is based on
http://selenic.com/pipermail/mercurial-devel/2010-June/021638.html
#!/bin/sh
hg init a
hg clone a b
cd a
echo '[paths]' >> .hg/hgrc
echo 'dupe = ../b' >> .hg/hgrc
hg in dupe | fgrep '../'
cd ..
hg -R a in dupe | fgrep '../'
true