[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3298: NixOS 19.09 CI job fails

[Tahoe-LAFS]

#3298: NixOS 19.09 CI job fails
---------------------------+---------------------------
 Reporter:  exarkun        |          Owner:
     Type:  defect         |         Status:  new
 Priority:  supercritical  |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
---------------------------+---------------------------
 It fails while building Eliot:

 {{{
 FAIL: test_logCallsDefaultLoggerWrite
 (eliot.tests.test_validation.MessageTypeTests)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/tmp/nix-build-
 python2.7-eliot-1.7.0.drv-0/eliot-1.7.0/eliot/tests/test_validation.py",
 line 533, in test_logCallsDefaultLoggerWrite
     self.assertEqual(messages[0][u"key"], 1234)
 AssertionError: 5 != 1234
 }}}

 I think this is similar to https://tahoe-lafs.org/trac/tahoe-
 lafs/ticket/3274

 This turns CI red.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3298>
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