haftmann [Tue, 17 Aug 2010 17:54:46 +0200] rev 38493
enforcing a singleton type inference parameter after type inference and before fixation prevents multiple type variables in import during class declaration
blanchet [Tue, 17 Aug 2010 16:49:51 +0200] rev 38491
invoke Variable.export/import_term on the entire formula, to make sure that schematic variables don't get different indices in different subterms;
this resulted in a subtle soundness bug in Sledgehammer -- introduced by the transition to FOF