[
    Expression {
        expr: Infix {
            lhs: Variable {
                name: "a",
            },
            op: Assign,
            rhs: Array {
                items: [
                    ArrayItem {
                        key: None,
                        value: Variable {
                            name: "a",
                        },
                        unpack: false,
                    },
                    ArrayItem {
                        key: None,
                        value: Variable {
                            name: "b",
                        },
                        unpack: false,
                    },
                    ArrayItem {
                        key: None,
                        value: Variable {
                            name: "c",
                        },
                        unpack: false,
                    },
                    ArrayItem {
                        key: None,
                        value: Variable {
                            name: "d",
                        },
                        unpack: false,
                    },
                ],
            },
        },
    },
]