Defs(
    Defs {
        tags: [
            Index(0),
        ],
        regions: [
            @0-4,
        ],
        space_before: [
            Slice(start = 0, length = 0),
        ],
        space_after: [
            Slice(start = 0, length = 0),
        ],
        spaces: [],
        type_defs: [
            Alias {
                header: TypeHeader {
                    name: @0-1 "R",
                    vars: [],
                },
                ann: @3-4 Apply(
                    "",
                    "D",
                    [],
                ),
            },
        ],
        value_defs: [],
    },
    @5-6 SpaceBefore(
        Var {
            module_name: "",
            ident: "a",
        },
        [
            Newline,
        ],
    ),
)