Re: [PATCH v3 1/4] rust: transmute: add `cast_slice[_mut]` functions

[Benno Lossin <benno.lossin@proton.me>]

On Mon Apr 21, 2025 at 8:42 PM CEST, Tamir Duberstein wrote:
> On Mon, Apr 21, 2025 at 9:50 AM Benno Lossin <benno.lossin@proton.me> wrote:
>> +/// Casts the type of a slice to another.
>> +///
>> +/// # Examples
>> +///
>> +/// ```rust
>> +/// # use kernel::transmute::cast_slice;
>> +/// #[repr(transparent)]
>> +/// #[derive(Debug)]
>> +/// struct Container<T>(T);
>> +///
>> +/// let array = [0u32; 42];
>> +/// let slice = &array;
>> +/// // SAFETY: `Container<T>` transparently wraps a `T`.
>> +/// let container_slice = unsafe { cast_slice(slice) };
>> +/// pr_info!("{container_slice}");
>> +/// ```
>
> How can this example compile? The type of `container_slice` can't
> possibly be known.

I should really start the habit of rerunning my testing scripts before
final submission... I added this example after the initial run... I
think you're correct in that it doesn't compile. Will fix for the next
version.

---
Cheers,
Benno