[
    Trait {
        name: Identifier {
            name: "foo",
        },
        attributes: [],
        body: [
            Method {
                name: Identifier {
                    name: "bar",
                },
                attributes: [],
                params: [],
                body: [
                    Expression {
                        expr: Call {
                            target: Identifier {
                                name: "exit",
                            },
                            args: [
                                Arg {
                                    name: None,
                                    value: LiteralInteger {
                                        i: 1,
                                    },
                                    unpack: false,
                                },
                            ],
                        },
                    },
                ],
                flags: [
                    Public,
                ],
                return_type: Some(
                    ParentReference,
                ),
                by_ref: false,
            },
        ],
    },
]