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,
        },
    ],
)