buildbot failure in Mercurial on hg tests

[hgbuildbot at kublai.com]

The Buildbot has detected a new failure on builder hg tests while building hg.
Full details are available at:
 http://hgbuildbot.kublai.com/builders/hg%20tests/builds/501

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

Buildslave for this Build: p64.osuosl.test

Build Reason: scheduler
Build Source Stamp: [branch default] 4c6f7f0dadaba9f7a0dce64ec0cd11c40373a98d
Blamelist: Bryan O'Sullivan <bryano at fb.com>,Kevin Bullock <kbullock at ringworld.org>,Simon Heimberg <simohe at besonet.ch>

BUILD FAILED: failed pure

sincerely,
 -The Buildbot