fs4 1.0.1

No libc, pure Rust cross-platform file locks. Original fs2, now supports async and replace libc by rustix.
Documentation 
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use std::io::{Error, Result};
use std::mem;
use std::os::windows::io::AsRawHandle;

use windows_sys::Win32::Foundation::HANDLE;
use windows_sys::Win32::Storage::FileSystem::{
    FileAllocationInfo, FileStandardInfo, GetFileInformationByHandleEx, LockFileEx,
    SetFileInformationByHandle, UnlockFile, FILE_ALLOCATION_INFO, FILE_STANDARD_INFO,
    LOCKFILE_EXCLUSIVE_LOCK, LOCKFILE_FAIL_IMMEDIATELY,
};

use smol::fs::File;
lock_impl!(File);
allocate!(File);
allocate_size!(File);

test_mod! {
  smol_potat::test,
  use crate::smol::AsyncFileExt;
  use smol::fs;
}