On Wed Mar 26, 2025 at 11:09 PM CET, Tamir Duberstein wrote:
On Wed, Mar 26, 2025 at 5:09 PM Benno Lossin benno.lossin@proton.me wrote:
On Wed Mar 26, 2025 at 8:06 PM CET, Tamir Duberstein wrote:
On Wed, Mar 26, 2025 at 1:36 PM Benno Lossin benno.lossin@proton.me wrote:
On Wed Mar 26, 2025 at 5:57 PM CET, Tamir Duberstein wrote:
Yeah, we should do this - but again: not relevant in this discussion.
I think it's pretty relevant.
It's not relevant because we're no longer talking about transmuting pointer to pointer. The two options are:
- transmute reference to reference.
- coerce reference to pointer, `as` cast pointer to pointer (triggers
`ptr_as_ptr`), reborrow pointer to reference.
If anyone can help me understand why (2) is better than (1), I'd certainly appreciate it.
I am very confident that (2) is correct. With (1) I'm not sure (see above), so that's why I mentioned it.
Can you help me understand why you're confident about (2) but not (1)?
My explanation from above explains why I'm not confident about (1):
For ptr-to-int transmutes, I know that they will probably remove provenance, hence I am a bit cautious about using them for ptr-to-ptr or ref-to-ref.
The reason I'm confident about (2) is that that is the canonical way to cast the type of a reference pointing to an `!Sized` value.
--- Cheers, Benno