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='2022-08-09 20:32:13 +0200'>2022-08-09</span></td><td><a href='/guix/commit/gnu/system/linux-container.scm?id=26af06b66b65354a46b2196d1c11c90168b7fa12'>linux-container: container-script: Parse command line options.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>