[
    Function {
        name: Identifier {
            name: "fib",
        },
        attributes: [],
        params: [
            Param {
                name: Variable {
                    name: "n",
                },
                attributes: [],
                type: None,
                variadic: false,
                default: None,
                flags: [],
                by_ref: false,
            },
        ],
        body: [
            If {
                condition: Infix {
                    lhs: Variable {
                        name: "n",
                    },
                    op: LessThan,
                    rhs: LiteralInteger {
                        i: 2,
                    },
                },
                then: [
                    Return {
                        value: Some(
                            Variable {
                                name: "n",
                            },
                        ),
                    },
                ],
                else_ifs: [],
                else: None,
            },
            Return {
                value: Some(
                    Infix {
                        lhs: Call {
                            target: Identifier {
                                name: "fib",
                            },
                            args: [
                                Arg {
                                    name: None,
                                    value: Infix {
                                        lhs: Variable {
                                            name: "n",
                                        },
                                        op: Sub,
                                        rhs: LiteralInteger {
                                            i: 1,
                                        },
                                    },
                                    unpack: false,
                                },
                            ],
                        },
                        op: Add,
                        rhs: Call {
                            target: Identifier {
                                name: "fib",
                            },
                            args: [
                                Arg {
                                    name: None,
                                    value: Infix {
                                        lhs: Variable {
                                            name: "n",
                                        },
                                        op: Sub,
                                        rhs: LiteralInteger {
                                            i: 2,
                                        },
                                    },
                                    unpack: false,
                                },
                            ],
                        },
                    },
                ),
            },
        ],
        return_type: None,
        by_ref: false,
    },
]