test/regress/regress0/chained-equality.smt2

   1 (set-option :produce-models true)
   2 (set-info :status unsat)
   3 (set-logic QF_UF)
   4 (declare-fun x () Bool)
   5 (declare-fun y () Bool)
   6 (declare-fun z () Bool)
   7 (assert (= x y z))
   8 (assert (not x))
   9 (assert z)
  10 (check-sat)