Dir does not implement AsFd

[chadaustin]

fstatfs takes as AsFd. It used to take AsRawFd in 0.26.

That's fine, but Dir does not implement AsFd, requiring an unsafe BorrowedFd construction.

[SteveLauC]

Hi, I fixed this in #2434:

nix/src/dir.rs

Lines 135 to 145 in db4ce6a

	impl std::os::fd::AsFd for Dir {
	fn as_fd(&self) -> std::os::fd::BorrowedFd {
	let raw_fd = self.as_raw_fd();
	// SAFETY:
	//
	// `raw_fd` should be open and valid for the lifetime of the returned
	// `BorrowedFd` as it is extracted from `&self`.
	unsafe { std::os::fd::BorrowedFd::borrow_raw(raw_fd) }
	}
	}

Though it has not been released yet.

Sigh, there are still a bunch of things to do before the 0.30.0 release, but I am too busy with my work and barely have time to push them. 😪

[chadaustin]

Perfect! No hurry, just will make things a little nicer in the future. Looking forward to the release when you have time!