SpaceBefore(
    Backpassing(
        [
            |L 1-1, C 0-1| Identifier(
                "x",
            ),
        ],
        |L 1-1, C 5-14| ParensAround(
            Closure(
                [
                    |L 1-1, C 7-8| Identifier(
                        "y",
                    ),
                ],
                |L 1-1, C 12-13| Var {
                    module_name: "",
                    ident: "y",
                },
            ),
        ),
        |L 3-3, C 0-1| SpaceBefore(
            Var {
                module_name: "",
                ident: "x",
            },
            [
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                Newline,
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        ),
    ),
    [
        LineComment(
            " leading comment",
        ),
    ],
)