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: tree_construction.rs
    path of file: ./repos/gosub-engine/benches
    
    the code of the file until where you have to start completion: use criterion::{criterion_group, criterion_main, Criterion};
use gosub_testing::testing::tree_construction;
use gosub_testing::testing::tree_construction::Harness;

fn criterion_benchmark(c: &mut Criterion) {
    let mut group = c.benchmark_group("Tree construction");
    group.significance_level(0.1).sample_size(500);

    // Careful about reading files inside the closure
    let filenames = Some(&["tests1.dat"][..]);
    let fixtures =
        tree_construction::fixture::read_fixtures(filenames).expect("problem loading fixtures");

    let mut har
    
fn criterion_benchmark(c: &mut Criterion) {
    let mut group = c.benchmark_group("Tree construction");
    group.significance_level(0.1).sample_size(500);

    // Careful about reading files inside the closure
    let filenames = Some(&["tests1.dat"][..]);
    let fixtures =
        tree_construction::fixture::read_fixtures(filenames).expect("problem loading fixtures");

    let mut harness = Harness::new();

    group.bench_function("fixtures", |b| {
        b.iter(|| {
            for root in &fixtures {
                for test in &root.tests {
                    for &scripting_enabled in test.script_modes() {
                        let _ = harness.run_test(test.clone(), scripting_enabled);
                    }
                }
            }
        });
    });

    group.finish();
}