DefinitionTree {
    definitions: [
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                comments: CommentGroup {
                    comments: [],
                },
                attributes: [],
                function: Keyword {
                    value: "function",
                    position: 1,
                },
                name: Identifier {
                    position: 10,
                    value: "foo",
                },
                templates: None,
                parameters: FunctionLikeParameterListDefinition {
                    comments: CommentGroup {
                        comments: [],
                    },
                    left_parenthesis: 13,
                    parameters: CommaSeparated {
                        inner: [],
                        commas: [],
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                    right_parenthesis: 14,
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                return_type: FunctionLikeReturnTypeDefinition {
                    colon: 15,
                    type_definition: Void(
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                            position: 17,
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                    left_brace: 22,
                    statements: [
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                                    comments: [],
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                                            comments: [],
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                                        object: Variable(
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                                                position: 28,
                                                name: "$a",
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                                        question_arrow: 30,
                                        method: Identifier {
                                            position: 33,
                                            value: "b",
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                                        generics: None,
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                                            comments: CommentGroup {
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                                            left_parenthesis: 34,
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                                                        comments: CommentGroup {
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                                                                position: 35,
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                                                commas: [],
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                                semicolon: 38,
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                    right_brace: 40,
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        ),
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    eof: 42,
}