Commits on Mar 3, 2022

1. Use HandleOrNull and HandleOrInvalid in the Windows FFI bindings. …

   Use the new `HandleOrNull` and `HandleOrInvalid` types that were introduced
   as part of [I/O safety] in a few functions in the Windows FFI bindings.
   
   This factors out an `unsafe` block and two `unsafe` function calls in the
   Windows implementation code.
   
   And, it helps test `HandleOrNull` and `HandleOrInvalid`, which indeed turned
   up a bug: `OwnedHandle` also needs to be `#[repr(transparent)]`, as it's
   used inside of `HandleOrNull` and `HandleOrInvalid` which are also
   `#[repr(transparent)]`.
   
   [I/O safety]: rust-lang#87074

   

   sunfishcode committed Mar 3, 2022
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