test/regress/regress0/flet.smtv1.smt2

   1 (set-option :incremental false)
   2 (set-info :status unsat)
   3 (set-logic QF_UF)
   4 (declare-sort U 0)
   5 (declare-fun a () Bool)
   6 (declare-fun b () Bool)
   7 (check-sat-assuming ( (and (and a b) (or (not a) (not b))) ))