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='2019-09-23 09:38:50 +0300'>2019-09-23</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=23cc2793e1b64c0d0218988fc76cf70f5ba8a612'>gnu: datamash: Update to 1.5.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/datamash.scm (datamash): Update to 1.5.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-12-23 16:37:51 +0200'>2018-12-23</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=b83ddd03d961ea0a0cf75eb6649ecec4fbd4fb94'>gnu: datamash: Update to 1.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/datamash.scm (datamash): Update to 1.4.
[source]: Remove patch.
* gnu/packages/patches/datamash-arm-tests.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.
</span></span></td><td>Efraim Flashner</td></tr>