[
    Function {
        name: Identifier {
            name: "foo",
        },
        params: [
            Param {
                name: Variable {
                    name: "b",
                },
                type: Some(
                    String,
                ),
                variadic: false,
                default: None,
                flags: [],
                by_ref: false,
            },
        ],
        body: [],
        return_type: None,
        by_ref: false,
    },
]