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='2021-05-11 09:17:00 -0400'>2021-05-11</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=a0178d34f582b50e9bdbb0403943129ae5b560ff'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-05-10 22:34:43 -0400'>2021-05-10</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=21fcced608c93e1ac836cdd9ab8c5d200c667e75'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-18 13:17:35 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=5ebe6904ea3881029e41147f49981ec2bd5f6cc7'>nls: Update 'fr' translations.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-01-28 16:41:18 +0100'>2021-01-28</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=a00af779047d92c0c0b4817b870bcae7fd610259'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-01-22 08:48:00 +0100'>2021-01-22</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=02e5c95db958a434a42c83f19c7f65437776831e'>Revert "nls: Update 'fr' translation."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 5d03ef73c3c1d995714abdaff650f73ac9fafc0f, which led
to these errors:

  /gnu/store/…-guix/fr.po:7206: 'msgstr' is not a valid Scheme format string, unlike 'msgid'. Reason: In the directive number 3, the character ' ' is not a valid conversion specifier.
  /gnu/store/…-guix/fr.po:7554: format specifications in 'msgid' and 'msgstr' are not equivalent
  /gnu/store/…-gettext-minimal-0.20.1/bin/msgfmt: found 2 fatal errors
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-01-22 00:31:28 +0100'>2021-01-22</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=5d03ef73c3c1d995714abdaff650f73ac9fafc0f'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-12-03 16:18:45 +0100'>2020-12-03</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=41fb3d5a9aa227b078fb95fdbf21d8198916a832'>nls: Update 'fr' translation of the manual.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-21 15:49:36 +0100'>2020-11-21</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=cf53ea79dda20c9ea90e3ca84bf7fdfd80b52e7d'>nls: Update 'fr' translation of the manual.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-09 00:14:17 +0100'>2020-11-09</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=f0ad0e85cdae95df17b2f66fec97fcf0a4e70a0b'>nls: Update 'fr' translations.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-11-03 12:47:43 +0100'>2020-11-03</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=595cd9cdb9070ffc6bb8e7b5c7d1285dcb756f8b'>nls: Update translations of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-10-30 00:59:37 +0100'>2020-10-30</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=61e839a9f9f7cc91982af696775c4f4ac72525f0'>nls: Update 'fr' translation of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-10-16 15:00:49 +0200'>2020-10-16</span></td><td><a href='/guix/commit/po/doc/guix-manual.fr.po?id=4dd989708c7ab34df0b60ce9b6c0a8ca5c15e858'>nls: Update manual translations.</a></td><td>Ludovic Courtès</td></tr>