pub fn symlink_dir<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> Result<()>
Creates a new directory symlink on the filesystem.
The dst path will be a directory symbolic link pointing to the src path.
use std::os::windows::fs;
fn main() -> std::io::Result<()> {
    fs::symlink_dir("a", "b")?;
    Ok(())
}
    © 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
    https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_dir.html