DefinitionTree {
    definitions: [
        Function(
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                comments: CommentGroup {
                    comments: [],
                },
                attributes: [],
                function: Keyword {
                    value: "function",
                    position: 0,
                },
                name: Identifier {
                    position: 9,
                    value: "m",
                },
                templates: None,
                parameters: FunctionLikeParameterListDefinition {
                    comments: CommentGroup {
                        comments: [],
                    },
                    left_parenthesis: 10,
                    parameters: CommaSeparated {
                        inner: [],
                        commas: [],
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                    right_parenthesis: 11,
                },
                return_type: FunctionLikeReturnTypeDefinition {
                    colon: 12,
                    type_definition: Void(
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                            position: 14,
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                    ),
                },
                body: BlockStatement {
                    comments: CommentGroup {
                        comments: [],
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                    left_brace: 19,
                    statements: [
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                                comments: CommentGroup {
                                    comments: [],
                                },
                                expression: AssignmentOperation(
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                                        comments: CommentGroup {
                                            comments: [],
                                        },
                                        left: Variable(
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                                                position: 25,
                                                name: "$e",
                                            },
                                        ),
                                        equals: 28,
                                        right: FunctionOperation(
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                                                comments: CommentGroup {
                                                    comments: [],
                                                },
                                                function: Parenthesized(
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                                                        comments: CommentGroup {
                                                            comments: [],
                                                        },
                                                        left_parenthesis: 30,
                                                        expression: ArrowFunction(
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                                                                comments: CommentGroup {
                                                                    comments: [],
                                                                },
                                                                attributes: [],
                                                                static: None,
                                                                fn: Keyword {
                                                                    value: "fn",
                                                                    position: 31,
                                                                },
                                                                parameters: FunctionLikeParameterListDefinition {
                                                                    comments: CommentGroup {
                                                                        comments: [],
                                                                    },
                                                                    left_parenthesis: 34,
                                                                    parameters: CommaSeparated {
                                                                        inner: [],
                                                                        commas: [],
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                                                                    right_parenthesis: 35,
                                                                },
                                                                return_type: FunctionLikeReturnTypeDefinition {
                                                                    colon: 36,
                                                                    type_definition: Identifier(
                                                                        TemplatedIdentifier {
                                                                            name: Identifier {
                                                                                position: 38,
                                                                                value: "\Generator",
                                                                            },
                                                                            templates: None,
                                                                        },
                                                                    ),
                                                                },
                                                                double_arrow: 49,
                                                                body: GeneratorOperation(
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                                                                        comments: CommentGroup {
                                                                            comments: [],
                                                                        },
                                                                        yield: Keyword {
                                                                            value: "yield",
                                                                            position: 52,
                                                                        },
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                                                        ),
                                                        right_parenthesis: 57,
                                                    },
                                                ),
                                                generics: None,
                                                arguments: ArgumentListExpression {
                                                    comments: CommentGroup {
                                                        comments: [],
                                                    },
                                                    left_parenthesis: 58,
                                                    arguments: CommaSeparated {
                                                        inner: [],
                                                        commas: [],
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                                                    right_parenthesis: 59,
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                                semicolon: 60,
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    eof: 64,
}