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: close_preopen_fd.rs
    path of file: ./repos/wasmer/tests/wasi-wast/wasi/tests
    
    the code of the file until where you have to start completion: // WASI:
// mapdir: hamlet:test_fs/hamlet

use std::fs;
use std::path::PathBuf;

#[cfg(target_os = "wasi")]
#[link(wasm_import_module = "wasi_unstable")]
extern "C" {
    fn fd_close(fd: u32) -> u16;
    fn fd_fdstat_set_flags(fd: u32, flags: u16) -> u16;
}

const FIRST_PREOPEN_FD: u32 = 4;

fn main() {
    #[cfg(target_os = "wasi")]
    {
        let result = unsafe { fd_fdstat_se
    
fn main() {
    #[cfg(target_os = "wasi")]
    {
        let result = unsafe { fd_fdstat_set_flags(FIRST_PREOPEN_FD, 1 << 2) };
        println!(
            "accessing preopen fd was a {}",
            if result == 0 { "success" } else { "failure" }
        );

        let result = unsafe { fd_close(FIRST_PREOPEN_FD) };
        println!(
            "Closing preopen fd was a {}",
            if result == 0 { "success" } else { "failure" }
        );

        let result = unsafe { fd_fdstat_set_flags(FIRST_PREOPEN_FD, 1 << 2) };
        println!(
            "accessing closed preopen fd was an EBADF error: {}",
            if result == 8 { "true" } else { "false" }
        );
    }

    #[cfg(not(target_os = "wasi"))]
    {
        println!("accessing preopen fd was a success");
        println!("Closing preopen fd was a success");
        println!("accessing closed preopen fd was an EBADF error: true");
    }
}