1; COMMAND-LINE: --incremental
2; EXPECT: unsat
3; EXPECT: sat
4
5; x not in A U B => x not in A
6(set-logic ALL_SUPPORTED)
7(define-sort SetInt () (Set Int))
8(declare-fun A () (Set Int))
9(declare-fun B () (Set Int))
10(declare-fun x () Int)
11(assert (not (member x (union A B))))
12(push 1)
13(assert (member x B))
14(check-sat)
15(pop 1)
16(check-sat)
17