chore: checkpoint before Python removal

vendor/tokio/src/fs/symlink_dir.rs

@@ -0,0 +1,19 @@
+use crate::fs::asyncify;
+
+use std::io;
+use std::path::Path;
+
+/// Creates a new directory symlink on the filesystem.
+///
+/// The `link` path will be a directory symbolic link pointing to the `original`
+/// path.
+///
+/// This is an async version of [`std::os::windows::fs::symlink_dir`][std]
+///
+/// [std]: https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_dir.html
+pub async fn symlink_dir(original: impl AsRef<Path>, link: impl AsRef<Path>) -> io::Result<()> {
+    let original = original.as_ref().to_owned();
+    let link = link.as_ref().to_owned();
+
+    asyncify(move || std::os::windows::fs::symlink_dir(original, link)).await
+}