You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: macro.rs
    path of file: ./repos/autometrics-rs/autometrics/tests/compilation/result_labels/pass
    
    the code of the file until where you have to start completion: //! This test uses interfaces not meant to be directly used.
//!
//! The goal here is to make sure that the macro has the effect we want.
//! autometrics (the library) is then responsible for orchestrating the
//! calls to `get_result_labels_for_value!` correctly when observing
//! function call results for the metrics.
use autometrics::get_result_labels_for_value;
use autometrics_macros::ResultLabels;

#[derive(Clone)]
struct Inner {}

#[derive(ResultLabels, Clone)]
enum MyEnum {
    /// When manually marked as 'error', returning this variant will
    /// _ALWAYS_ be considered as an error for Autometrics.
    /// Notably, even if you return Ok(MyEnum::Empty) from a function.
    #[label(result = "error")]
    Empty,
    /// When manually marked as 'ok', returning this variant will
    /// _ALWAYS_ be considered as a succesful result for Autometrics.
    /// Notably, even if you return Err(MyEnum::Empty) from a function.
    #[label(result = "ok")]
    ClientError { inner: Inner },
    /// Without any manual override, Autometrics will guess from the
    /// context when possible to know whether something is an issue or
    /// not. This means:
    /// - Ok(MyEnum::AmbiguousValue(_)) is a success for Autometrics
    /// - Err(MyEnum::AmbiguousValue(_)) is an error for Autometrics
    /// - Just returning MyEnum::AmbiguousValue(_) won't do anything (just like returning
    ///   a bare primitive type like usize)
    AmbiguousValue(u64),
}

fn main() {
    let is_ok = MyEnum:
    
fn main() {
    let is_ok = MyEnum::ClientError { inner: Inner {} };
    let labels = get_result_labels_for_value!(&is_ok);
    assert_eq!(labels.unwrap().0, "ok");

    let err = MyEnum::Empty;
    let labels = get_result_labels_for_value!(&err);
    assert_eq!(labels.unwrap().0, "error");

    let no_idea = MyEnum::AmbiguousValue(42);
    let labels = get_result_labels_for_value!(&no_idea);
    assert_eq!(labels, None);

    // Testing behaviour within an Ok() error variant
    let ok: Result<MyEnum, ()> = Ok(is_ok.clone());
    let labels = get_result_labels_for_value!(&ok);
    assert_eq!(
        labels.unwrap().0,
        "ok",
        "When wrapped as the Ok variant of a result, a manually marked 'ok' variant translates to 'ok'."
    );

    let ok: Result<MyEnum, ()> = Ok(no_idea.clone());
    let labels = get_result_labels_for_value!(&ok);
    assert_eq!(
        labels.unwrap().0,
        "ok",
        "When wrapped as the Ok variant of a result, an ambiguous variant translates to 'ok'."
    );

    let err_in_ok: Result<MyEnum, ()> = Ok(err.clone());
    let labels = get_result_labels_for_value!(&err_in_ok);
    assert_eq!(
        labels.unwrap().0,
        "error",
        "When wrapped as the Ok variant of a result, a manually marked 'error' variant translates to 'error'."
    );

    // Testing behaviour within an Err() error variant
    let ok_in_err: Result<(), MyEnum> = Err(is_ok);
    let labels = get_result_labels_for_value!(&ok_in_err);
    assert_eq!(
        labels.unwrap().0,
        "ok",
        "When wrapped as the Err variant of a result, a manually marked 'ok' variant translates to 'ok'."
    );

    let not_ok: Result<(), MyEnum> = Err(err);
    let labels = get_result_labels_for_value!(&not_ok);
    assert_eq!(
        labels.unwrap().0,
        "error",
        "When wrapped as the Err variant of a result, a manually marked 'error' variant translates to 'error'."
    );

    let ambiguous: Result<(), MyEnum> = Err(no_idea);
    let labels = get_result_labels_for_value!(&ambiguous);
    assert_eq!(
        labels.unwrap().0,
        "error",
        "When wrapped as the Err variant of a result, an ambiguous variant translates to 'error'."
    );
}