Re: [PATCH v3 7/7] rust: io: mem: return DevresLt from IoMem/ExclusiveIoMem::into_devres()

On Fri Jun 19, 2026 at 8:08 AM JST, Danilo Krummrich wrote:
> Implement ForLt and CovariantForLt for IoMem<'static, SIZE> and
> ExclusiveIoMem<'static, SIZE> so that DevresLt can shorten the stored
> 'static lifetime back to the caller's borrow lifetime.
>
> CovariantForLt is sound because both types only hold &'a Device<Bound>,
> which is covariant over 'a.
>
> Since DevresLt::new() handles the lifetime transmutation internally,
> into_devres() no longer needs an explicit transmute to 'static.
>
> Add DevresIoMem<SIZE> and DevresExclusiveIoMem<SIZE> type aliases.
>
> Signed-off-by: Danilo Krummrich <[email protected]>

Reviewed-by: Alexandre Courbot <[email protected]>