Mon, 15 Jun 2015 10:38:09 +0200 wenzelm tuned;
Mon, 15 Jun 2015 10:33:37 +0200 wenzelm more robust: variables need not occur in body;
Mon, 15 Jun 2015 10:25:49 +0200 wenzelm tuned;
Mon, 15 Jun 2015 00:23:18 +0200 wenzelm tuned whitespace;
Sun, 14 Jun 2015 23:22:31 +0200 wenzelm merged
Sun, 14 Jun 2015 23:22:08 +0200 wenzelm improved treatment of Element.Obtains via Expression.prepare_stmt;
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