Function preopen

crates/test-programs/src/bin/p2_cli_hostcall_fuel.rs:35–39

()

}

fn preopen() -> Descriptor {
    let mut dirs = wasip2::filesystem::preopens::get_directories();
    assert_eq!(dirs.len(), 1);
    dirs.pop().unwrap().0
}

fn read() {
    let f = preopen()