DefinitionTree {
    definitions: [
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                    comments: CommentGroup {
                        comments: [],
                    },
                    attributes: [],
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                        value: "enum",
                        position: 0,
                    },
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                        position: 5,
                        value: "Foo",
                    },
                    backed_type: String(
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                            value: "string",
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                    ),
                    implements: None,
                    body: BackedEnumBodyDefinition {
                        left_brace: 17,
                        members: [
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                                    attributes: [],
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                                        position: 23,
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                                        value: "Bar",
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                                    equals: 32,
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                                                value: "'3'",
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                                    equals: 52,
                                    value: Literal(
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                                    semicolon: 57,
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                        right_brace: 59,
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    eof: 61,
}