Sample error message:

======================================================================
FAIL: test_cover_files_written_no_highlight (test.test_trace.TestCoverageCommandLineOutput)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.nondebug/build/Lib/test/test_trace.py", line 393, in test_cover_files_written_no_highlight
    self.assertFalse(os.path.exists(tracecoverpath))
AssertionError: True is not false
----------------------------------------------------------------------
Ran 21 tests in 17.796s
FAILED (failures=1)
test test_trace failed
1 test failed again:
    test_trace


On Sat, 25 Aug 2018 at 10:10, <buildbot@python.org> wrote:
The Buildbot has detected a failed build on builder AMD64 Debian PGO 3.x while building python/cpython.
Full details are available at:
    https://buildbot.python.org/all/#builders/47/builds/1423

Buildbot URL: https://buildbot.python.org/all/

Worker for this Build: gps-debian-profile-opt

Build Reason: <unknown>
Blamelist: Serhiy Storchaka <storchaka@gmail.com>

BUILD FAILED: failed test (failure)

Sincerely,
 -The Buildbot
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