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='2023-11-15 18:03:01 +0200'>2023-11-15</span></td><td><a href='/guix/commit/gnu/packages/patches/ghc-basement-fix-32bit.patch?id=4c46dc9a4a698ca705e089245d334c731615717a'>gnu: ghc-basement: Fix build on i686-linux.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>