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='2019-11-12 03:33:06 +0100'>2019-11-12</span></td><td><a href='/guix/commit/gnu/packages/rdf.scm?id=268b69f9513b5e53d85b996bad931c7eba5db059'>gnu: sord: Update to 0.16.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rdf.scm (sord): Update to 0.16.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-07-17 16:03:56 +0200'>2019-07-17</span></td><td><a href='/guix/commit/gnu/packages/rdf.scm?id=ef421791c500d869f399da66503cbfd8c003717c'>gnu: sord: Propagate serd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rdf.scm (sord)[inputs]: Move serd from here…
[propagated-inputs]: …to here.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>