The Clar test framework has a bug whereby it skips the parsing phase
on files with mtime=0.

Reported upstream at <https://github.com/vmg/clar/pull/78>.

diff --git a/tests/generate.py b/tests/generate.py
index b639c8f..111ca41 100644
--- a/tests/generate.py
+++ b/tests/generate.py
@@ -63,3 +63,3 @@ class Module(object):
 
-        self.mtime = 0
+        self.mtime = None # Guix sets all file mtimes to '0'
         self.enabled = True
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<tr><td><span title='2019-03-31 20:51:10 +0300'>2019-03-31</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=36a4366d79a310d05db0de2cf6d5bb3c5e861d4b'>gnu: Fix descriptions to not use quotes.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-03-11 22:04:40 +0100'>2018-03-11</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=189be331acfda1c242a9c85fca8d2a0356742f48'>build-system/gnu: Add 'bootstrap' phase.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-04 00:10:59 -0400'>2017-09-04</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=d10092b849153dc27cfed0a9601fde6c7bdec918'>gnu: Put autoconf-related phases immediately after the 'unpack phase.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-08-27 18:24:49 -0400'>2017-08-27</span></td><td><a href='/guix/commit/gnu/packages/microcom.scm?id=5f13bf0972310dfd5e2f26a4adc8b5aab4be7407'>gnu: Fetch several Git sources over HTTPS.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>