DefinitionTree {
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                comments: CommentGroup {
                    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 {
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                        commas: [],
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                    right_parenthesis: 13,
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                return_type: FunctionLikeReturnTypeDefinition {
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                    type_definition: Void(
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                },
                body: BlockStatement {
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                        comments: [],
                    },
                    left_brace: 21,
                    statements: [
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                                comments: CommentGroup {
                                    comments: [],
                                },
                                using: Keyword {
                                    value: "using",
                                    position: 27,
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                                assignments: CommaSeparated {
                                    inner: [],
                                    commas: [],
                                },
                                if_clause: None,
                                block: BlockStatement {
                                    comments: CommentGroup {
                                        comments: [],
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                                    left_brace: 33,
                                    statements: [],
                                    right_brace: 40,
                                },
                            },
                        ),
                        Using(
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                                comments: CommentGroup {
                                    comments: [],
                                },
                                using: Keyword {
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                                    position: 47,
                                },
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                                    inner: [],
                                    commas: [],
                                },
                                if_clause: Some(
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                                            comments: [],
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                                            position: 53,
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                                                position: 56,
                                                name: "$a",
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                                ),
                                block: BlockStatement {
                                    comments: CommentGroup {
                                        comments: [],
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                                    left_brace: 59,
                                    statements: [],
                                    right_brace: 66,
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                                    comments: [],
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                                            comments: CommentGroup {
                                                comments: [],
                                            },
                                            variable: Variable {
                                                position: 79,
                                                name: "$a",
                                            },
                                            equals: 82,
                                            expression: FunctionOperation(
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                                                        comments: [],
                                                    },
                                                    function: Identifier(
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                                                            value: "foo",
                                                        },
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                                                    generics: None,
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                                                        comments: CommentGroup {
                                                            comments: [],
                                                        },
                                                        left_parenthesis: 87,
                                                        arguments: CommaSeparated {
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                                                            commas: [],
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                                    commas: [],
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                                                name: "$a",
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                                ),
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                                    statements: [],
                                    right_brace: 103,
                                },
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                                    comments: [],
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                                    position: 110,
                                },
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                                                comments: [],
                                            },
                                            variable: Variable {
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                                                name: "$a",
                                            },
                                            equals: 119,
                                            expression: FunctionOperation(
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                                                    comments: CommentGroup {
                                                        comments: [],
                                                    },
                                                    function: Identifier(
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                                                            position: 121,
                                                            value: "foo",
                                                        },
                                                    ),
                                                    generics: None,
                                                    arguments: ArgumentListExpression {
                                                        comments: CommentGroup {
                                                            comments: [],
                                                        },
                                                        left_parenthesis: 124,
                                                        arguments: CommaSeparated {
                                                            inner: [],
                                                            commas: [],
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                                            ),
                                        },
                                    ],
                                    commas: [],
                                },
                                if_clause: None,
                                block: BlockStatement {
                                    comments: CommentGroup {
                                        comments: [],
                                    },
                                    left_brace: 127,
                                    statements: [],
                                    right_brace: 134,
                                },
                            },
                        ),
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                    right_brace: 136,
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            },
        ),
    ],
    eof: 138,
}