[
    Expression {
        expression: Variable(
            VariableVariable(
                VariableVariable {
                    span: (
                        1,
                        7,
                    ),
                    variable: SimpleVariable(
                        SimpleVariable {
                            span: (
                                1,
                                8,
                            ),
                            name: "a",
                        },
                    ),
                },
            ),
        ),
        end: (
            1,
            10,
        ),
    },
]
