DefinitionTree {
    definitions: [
        Function(
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                comments: CommentGroup {
                    comments: [],
                },
                attributes: [],
                function: Keyword {
                    value: "function",
                    position: 0,
                },
                name: Identifier {
                    position: 9,
                    value: "a",
                },
                templates: None,
                parameters: FunctionLikeParameterListDefinition {
                    comments: CommentGroup {
                        comments: [],
                    },
                    left_parenthesis: 10,
                    parameters: CommaSeparated {
                        inner: [],
                        commas: [],
                    },
                    right_parenthesis: 11,
                },
                return_type: FunctionLikeReturnTypeDefinition {
                    colon: 12,
                    type_definition: Literal(
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                                comments: CommentGroup {
                                    comments: [],
                                },
                                true: Keyword {
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                                    position: 14,
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                            },
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                },
                body: BlockStatement {
                    comments: CommentGroup {
                        comments: [],
                    },
                    left_brace: 19,
                    statements: [
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                                comments: CommentGroup {
                                    comments: [],
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                                return: Keyword {
                                    value: "return",
                                    position: 25,
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                                expression: Some(
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                                                comments: CommentGroup {
                                                    comments: [],
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                                                true: Keyword {
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                                                    position: 32,
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                                        ),
                                    ),
                                ),
                                semicolon: 36,
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                        ),
                    ],
                    right_brace: 38,
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        ),
    ],
    eof: 40,
}