[
    Expression {
        expr: InterpolatedString {
            parts: [
                Expr(
                    Variable {
                        name: "foo",
                    },
                ),
                Expr(
                    ArrayIndex {
                        array: Variable {
                            name: "foo",
                        },
                        index: Some(
                            LiteralInteger {
                                i: 0,
                            },
                        ),
                    },
                ),
                Expr(
                    ArrayIndex {
                        array: Variable {
                            name: "foo",
                        },
                        index: Some(
                            LiteralString {
                                value: "bar",
                            },
                        ),
                    },
                ),
                Expr(
                    DynamicVariable {
                        name: Variable {
                            name: "foo",
                        },
                    },
                ),
            ],
        },
    },
]