Wed, 29 May 2013 23:11:21 +0200 wenzelm obsolete;
Wed, 29 May 2013 18:55:37 +0200 wenzelm resolve_inc_tyvars: back to old behavior before 0fa3b456a267 where types of equal Vars are *not* unified -- recover last example in src/HOL/Metis_Examples/Clausification.thy;
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