Thu, 20 Mar 2008 17:38:55 +0100 wenzelm thm_antiq: produce error at runtime, not compile time;
Thu, 20 Mar 2008 17:38:54 +0100 wenzelm get_thms etc.: improved reporting of source position;
Thu, 20 Mar 2008 17:38:53 +0100 wenzelm added pos_of_ref;
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