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/137

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

Buildslave for this Build: l6

Build Reason: scheduler
Build Source Stamp: [branch default] 4dd0369774639ec7b778e82fa5a47d3700244c99
Blamelist: Thomas Arendsen Hein <thomas at intevation.de>

BUILD FAILED: failed http2

sincerely,
 -The Buildbot