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: all.rs
    path of file: ./repos/wasmtime/crates/wasi-nn/tests
    
    the code of the file until where you have to start completion: //! Run the wasi-nn tests in `crates/test-programs`.

use anyhow::Result;
use std::path::Path;
use test_programs_artifacts::*;
use wasi_common::sync::{Dir, WasiCtxBuilder};
use wasi_common::WasiCtx;
use wasmtime::{Config, Engine, Linker, Module, Store};
use wasmtime_wasi_nn::{backend, testing, Backend, InMemoryRegistry, WasiNnCtx};

const PREOPENED_DIR_NAME: &str = "fixture";

/// Run a wasi-nn test program. This is modeled after
/// `crates/wasi/tests/all/main.rs` but still uses the older preview1 API for
/// file reads.
fn run(path: &str, preload_model: bool) -> Result<()> {
    wasmtime_wasi_nn::check_test!();
    let path = Path::new(path);
  
    
fn run(path: &str, preload_model: bool) -> Result<()> {
    wasmtime_wasi_nn::check_test!();
    let path = Path::new(path);
    let config = Config::new();
    let engine = Engine::new(&config)?;
    let mut linker = Linker::new(&engine);
    wasmtime_wasi_nn::witx::add_to_linker(&mut linker, |s: &mut Ctx| &mut s.wasi_nn)?;
    wasi_common::sync::add_to_linker(&mut linker, |s: &mut Ctx| &mut s.wasi)?;
    let module = Module::from_file(&engine, path)?;
    let mut backends = vec![];
    #[cfg(feature = "openvino")]
    {
        backends.push(Backend::from(backend::openvino::OpenvinoBackend::default()));
    }
    #[cfg(feature = "winml")]
    {
        backends.push(Backend::from(backend::winml::WinMLBackend::default()));
    }
    for backend in backends {
        let mut store = Store::new(
            &engine,
            Ctx::new(&testing::artifacts_dir(), preload_model, backend)?,
        );
        let instance = linker.instantiate(&mut store, &module)?;
        let start = instance.get_typed_func::<(), ()>(&mut store, "_start")?;
        start.call(&mut store, ())?;
    }
    Ok(())
}