Sun, 13 Mar 2011 20:56:00 +0100 wenzelm files are identified via SHA1 digests -- discontinued ISABELLE_FILE_IDENT;
Sun, 13 Mar 2011 20:21:24 +0100 wenzelm explicit type SHA1.digest;
Sun, 13 Mar 2011 19:27:39 +0100 wenzelm slightly more robust bash exec, which fails on empty executable;
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