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 2-4, C 0-1| SpaceBefore(
            Backpassing(
                [
                    |L 2-2, C 0-1| Identifier(
                        "z",
                    ),
                ],
                |L 2-2, C 5-7| Record(
                    [],
                ),
                |L 4-4, C 0-1| SpaceBefore(
                    Var {
                        module_name: "",
                        ident: "x",
                    },
                    [
                        Newline,
                        Newline,
                    ],
                ),
            ),
            [
                Newline,
            ],
        ),
    ),
    [
        LineComment(
            " leading comment",
        ),
    ],
)