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Implement ExitCodeExt for Windows Fixes #97914 ### Motivation: On Windows it is common for applications to return `HRESULT` (`i32`) or `DWORD` (`u32`) values. These stem from COM based components ([HRESULTS](https://docs.microsoft.com/en-us/windows/win32/api/objbase/nf-objbase-coinitialize)), Win32 errors ([GetLastError](https://docs.microsoft.com/en-us/windows/win32/api/errhandlingapi/nf-errhandlingapi-getlasterror)), GUI applications ([WM_QUIT](https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-quit)) and more. The newly stabilized `ExitCode` provides an excellent fit for propagating these values, because `std::process::exit` does not run deconstructors which can result in errors. However, `ExitCode` currently only implements `From<u8> for ExitCode`, which disallows the full range of `i32`/`u32` values. This pull requests attempts to address that shortcoming by providing windows specific extensions that accept a `u32` value (which covers all possible `HRESULTS` and Win32 errors) analog to [ExitStatusExt::from_raw](https://doc.rust-lang.org/std/os/windows/process/trait.ExitStatusExt.html#tymethod.from_raw). This was also intended by the original Stabilization https://github.com/rust-lang/rust/pull/93840#issue-1129209143= as pointed out by ``@eggyal`` in https://github.com/rust-lang/rust/issues/97914#issuecomment-1151076755: > Issues around platform specific representations: We resolved this issue by changing the return type of report from i32 to the opaque type ExitCode. __That way we can change the underlying representation without affecting the API, letting us offer full support for platform specific exit code APIs in the future.__ [Emphasis added] ### API ```rust /// Windows-specific extensions to [`process::ExitCode`]. /// /// This trait is sealed: it cannot be implemented outside the standard library. /// This is so that future additional methods are not breaking changes. #[stable(feature = "windows_process_exit_code_from", since = "1.63.0")] pub trait ExitCodeExt: Sealed { /// Creates a new `ExitCode` from the raw underlying `u32` return value of /// a process. #[stable(feature = "windows_process_exit_code_from", since = "1.63.0")] fn from_raw(raw: u32) -> Self; } #[stable(feature = "windows_process_exit_code_from", since = "1.63.0")] impl ExitCodeExt for process::ExitCode { fn from_raw(raw: u32) -> Self { process::ExitCode::from_inner(From::from(raw)) } } ``` ### Misc I apologize in advance if I misplaced any attributes regarding stabilzation, as far as I learned traits are insta-stable so I chose to make them stable. If this is an error, please let me know and I'll correct it. I also added some additional machinery to make it work, analog to [ExitStatus](https://doc.rust-lang.org/std/process/struct.ExitStatus.html#). EDIT: Proposal: https://github.com/rust-lang/libs-team/issues/48 |
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