1const std = @import("std");
 2const expect = std.testing.expect;
 3
 4test "turn HashMap into a set with void" {
 5    var map = std.AutoHashMap(i32, void).init(std.testing.allocator);
 6    defer map.deinit();
 7
 8    try map.put(1, {});
 9    try map.put(2, {});
10
11    try expect(map.contains(2));
12    try expect(!map.contains(3));
13
14    _ = map.remove(2);
15    try expect(!map.contains(2));
16}
17
18// test