; COMMAND-LINE: --sygus-out=status
; EXPECT: unsat
(set-logic LIA)

(declare-datatypes ((List 0)) (((cons (head Int) (tail List)) (nil))))

(synth-fun f ((x Int)) List)

(declare-var x Int)

(constraint (= (f x) (cons (+ x 1) nil)))
(check-synth)