[
    Expression {
        expr: Array {
            items: [
                ArrayItem {
                    key: None,
                    value: LiteralInteger {
                        i: "1",
                    },
                    unpack: false,
                    by_ref: false,
                },
                ArrayItem {
                    key: None,
                    value: LiteralInteger {
                        i: "2",
                    },
                    unpack: false,
                    by_ref: false,
                },
                ArrayItem {
                    key: None,
                    value: Empty,
                    unpack: false,
                    by_ref: false,
                },
                ArrayItem {
                    key: None,
                    value: LiteralInteger {
                        i: "4",
                    },
                    unpack: false,
                    by_ref: false,
                },
            ],
        },
    },
]