When(
    |L 0-0, C 5-6| Var {
        module_name: "",
        ident: "x",
    },
    [
        WhenBranch {
            patterns: [
                |L 1-1, C 4-5| SpaceBefore(
                    NumLiteral(
                        "1",
                    ),
                    [
                        Newline,
                    ],
                ),
            ],
            value: |L 1-2, C 9-6| Apply(
                |L 1-1, C 9-16| Var {
                    module_name: "Num",
                    ident: "neg",
                },
                [
                    |L 2-2, C 5-6| SpaceBefore(
                        Num(
                            "2",
                        ),
                        [
                            Newline,
                        ],
                    ),
                ],
                Space,
            ),
            guard: None,
        },
        WhenBranch {
            patterns: [
                |L 3-3, C 4-5| SpaceBefore(
                    Underscore(
                        "",
                    ),
                    [
                        Newline,
                    ],
                ),
            ],
            value: |L 3-3, C 9-10| Num(
                "4",
            ),
            guard: None,
        },
    ],
)