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: combinators.rs
    path of file: ./repos/tracing/tracing-subscriber/tests/subscriber_filters
    
    the code of the file until where you have to start completion: use super::*;
use tracing_subscriber::{
    filter::{filter_fn, FilterExt, LevelFilter},
    prelude::*,
};

#[test]
fn and() {
    let (subscriber, handle) = subscriber::mock()
        .event(
            event::msg("a very interesting event")
                .at_level(tracing::Level::INFO)
                .with_target("interesting_target"),
        )
        .only()
        .run_with_handle();

    // Enables spans and events with targets starting with `interesting_target`:
    let target_filter = filter::filter_fn(|meta| meta.target().starts_with("interesting_target"));

    // Enables spans and events with levels `INFO` and below:
    let level_filter = LevelFilter::INFO;

    // Combine the two filters together, returning a filter that only enables
    // spans and events that *both* filters will enable:
    let filter = target_filter.and(level_filter);

    let _subscriber = tracing_subscriber::registry()
        .with(subscriber.with_filter(filter))
        .set_default();

    // This event will 
    
fn and() {
    let (subscriber, handle) = subscriber::mock()
        .event(
            event::msg("a very interesting event")
                .at_level(tracing::Level::INFO)
                .with_target("interesting_target"),
        )
        .only()
        .run_with_handle();

    // Enables spans and events with targets starting with `interesting_target`:
    let target_filter = filter::filter_fn(|meta| meta.target().starts_with("interesting_target"));

    // Enables spans and events with levels `INFO` and below:
    let level_filter = LevelFilter::INFO;

    // Combine the two filters together, returning a filter that only enables
    // spans and events that *both* filters will enable:
    let filter = target_filter.and(level_filter);

    let _subscriber = tracing_subscriber::registry()
        .with(subscriber.with_filter(filter))
        .set_default();

    // This event will *not* be enabled:
    tracing::info!("an event with an uninteresting target");

    // This event *will* be enabled:
    tracing::info!(target: "interesting_target", "a very interesting event");

    // This event will *not* be enabled:
    tracing::debug!(target: "interesting_target", "interesting debug event...");

    handle.assert_finished();
}