Wed, 19 Jul 2006 12:12:01 +0200 wenzelm export make_context, is_declared;
Wed, 19 Jul 2006 12:12:00 +0200 wenzelm prove: Variable.declare_internal (more efficient);
Wed, 19 Jul 2006 12:11:59 +0200 wenzelm add_local: simplified interface, all frees are known'';
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