Fri, 01 Aug 2014 22:52:53 +0200 wenzelm prefer non-strict Execution.print, e.g relevant for redirected ML compiler reports after error (see also e79f76a48449 and 40274e4f5ebf);
Fri, 01 Aug 2014 15:08:49 +0200 blanchet careful when calling 'Thm.proof_body_of' -- it can throw exceptions
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