DefinitionTree {
    definitions: [
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                    comments: [],
                },
                attributes: [],
                function: Keyword {
                    value: "function",
                    position: 0,
                },
                name: Identifier {
                    position: 9,
                    value: "foo",
                },
                templates: None,
                parameters: FunctionLikeParameterListDefinition {
                    comments: CommentGroup {
                        comments: [],
                    },
                    left_parenthesis: 12,
                    parameters: CommaSeparated {
                        inner: [],
                        commas: [],
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                    right_parenthesis: 13,
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                return_type: FunctionLikeReturnTypeDefinition {
                    colon: 14,
                    type_definition: Void(
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                            position: 16,
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                body: BlockStatement {
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                    left_brace: 21,
                    statements: [],
                    right_brace: 22,
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    ],
    eof: 23,
}