When(
    @5-11 Tuple(
        [
            @6-7 Num(
                "1",
            ),
            @9-10 Num(
                "2",
            ),
        ],
    ),
    [
        WhenBranch {
            patterns: [
                @16-22 SpaceBefore(
                    Tuple(
                        [
                            @17-18 NumLiteral(
                                "1",
                            ),
                            @20-21 Identifier(
                                "x",
                            ),
                        ],
                    ),
                    [
                        Newline,
                    ],
                ),
            ],
            value: @26-27 Var {
                module_name: "",
                ident: "x",
            },
            guard: None,
        },
        WhenBranch {
            patterns: [
                @29-35 SpaceBefore(
                    Tuple(
                        [
                            @30-31 Underscore(
                                "",
                            ),
                            @33-34 Identifier(
                                "b",
                            ),
                        ],
                    ),
                    [
                        Newline,
                    ],
                ),
            ],
            value: @39-44 BinOps(
                [
                    (
                        @39-40 Num(
                            "3",
                        ),
                        @41-42 Plus,
                    ),
                ],
                @43-44 Var {
                    module_name: "",
                    ident: "b",
                },
            ),
            guard: None,
        },
    ],
)