DefinitionTree {
    definitions: [
        Class(
            ClassDefinition {
                comments: CommentGroup {
                    comments: [],
                },
                attributes: [],
                modifiers: ModifierGroupDefinition {
                    position: 9,
                    modifiers: [
                        Readonly(
                            Keyword {
                                value: "readonly",
                                position: 0,
                            },
                        ),
                    ],
                },
                class: Keyword {
                    value: "class",
                    position: 9,
                },
                name: Identifier {
                    position: 15,
                    value: "Foo",
                },
                templates: None,
                extends: None,
                implements: None,
                body: ClassDefinitionBody {
                    left_brace: 19,
                    members: [],
                    right_brace: 20,
                },
            },
        ),
    ],
    eof: 21,
}