DefinitionTree {
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                    comments: [],
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                attributes: [],
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                    value: "function",
                    position: 0,
                },
                name: Identifier {
                    position: 9,
                    value: "foo",
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                templates: None,
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                    comments: CommentGroup {
                        comments: [],
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                    left_parenthesis: 12,
                    parameters: CommaSeparated {
                        inner: [],
                        commas: [],
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                    right_parenthesis: 13,
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                    left_brace: 23,
                    statements: [],
                    right_brace: 24,
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    eof: 25,
}