[
    Expression {
        expr: Call {
            target: Identifier {
                name: "foo",
            },
            args: [
                Arg {
                    name: None,
                    value: Variable {
                        name: "a",
                    },
                    unpack: false,
                },
                Arg {
                    name: None,
                    value: Variable {
                        name: "b",
                    },
                    unpack: false,
                },
                Arg {
                    name: None,
                    value: Variable {
                        name: "c",
                    },
                    unpack: false,
                },
                Arg {
                    name: None,
                    value: Variable {
                        name: "d",
                    },
                    unpack: true,
                },
            ],
        },
    },
]