buildbot exception in Mercurial on OS X 10.7 hg tests (stable)

[hgbuildbot at kublai.com]

The Buildbot has detected a new failure on builder OS X 10.7 hg tests (stable) while building hg.
Full details are available at:
 http://hgbuildbot.kublai.com/builders/OS%20X%2010.7%20hg%20tests%20%28stable%29/builds/244

Buildbot URL: http://hgbuildbot.kublai.com/

Buildslave for this Build: lion

Build Reason: scheduler
Build Source Stamp: [branch stable] 54cedee86e5126188b0dcfbd7015bcdca7f6c2e2
Blamelist: Durham Goode <durham at fb.com>

BUILD FAILED: exception setproperty RemoveDirectory

sincerely,
 -The Buildbot