Commits on Feb 11, 2022

1. Implement AsFd for &T and &mut T. …

   Add implementations of `AsFd` for `&T` and `&mut T`, so that users can
   write code like this:
   
   ```rust
   pub fn fchown<F: AsFd>(fd: F, uid: Option<u32>, gid: Option<u32>) -> io::Result<()> {
   ```
   
   with `fd: F` rather than `fd: &F`.
   
   And similar for `AsHandle` and `AsSocket` on Windows.
   
   Also, adjust the `fchown` example to pass the file by reference. The
   code can work either way now, but passing by reference is more likely
   to be what users will want to do.
   
   This is an alternative to rust-lang#93869, and is a simpler way to achieve the
   same goals: users don't need to pass borrowed-`BorrowedFd` arguments,
   and it prevents a pitfall in the case where users write `fd: F` instead
   of `fd: &F`.

   

   sunfishcode committed Feb 11, 2022
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