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/134

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

Buildslave for this Build: l6

Build Reason: scheduler
Build Source Stamp: [branch default] ad229181ddbed0ebd93bf48bb36a22e965d8a4a0
Blamelist: Adrian Buehlmann <adrian at cadifra.com>,Mads Kiilerich <mads at kiilerich.com>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot