A user of TortoiseHg has reported this, which I confirmed with recent
crew version of Mercurial:
$ hg -R crew# tip
changeset: 6797:694223a29ad4
tag: tip
user: byron at base2.cc
date: Thu Jul 03 20:53:14 2008 -0700
summary: Added missing --config global option to zsh_completion.
$ hg clone crew# c1
abort: repository crew not found!