Dir does not implement AsFd

[chadaustin]

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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:

https://github.com/nix-rust/nix/blob/db4ce6aef3ee8e38724385377910b54efa1fddaa/src/dir.rs#L135-L145

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!