(declare-sort u 0)
(declare-fun p0 () Bool)
(declare-fun a () u)
(declare-fun b () u)
(declare-fun c () u)
(declare-fun f (u) u)
(assert (= (! (f b) :named fb) c))
(assert (= b a))
(assert (not (! (= (f a) c) :named goal)))
(check-sat)