Fri, 10 Jul 2020 22:38:03 +0200 wenzelm proper session Timing for build_history log file (see 5c4800f6b25a);
Fri, 10 Jul 2020 21:58:49 +0200 wenzelm clarified signature;
Fri, 10 Jul 2020 21:30:21 +0200 wenzelm more robust, notably for isabelle_cronjob;
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