linux-kernel - Re: [PATCH v2 2/6] rust: types: avoid `as` casts

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Message-ID: <CAJ-ks9=mazJyTVLHfvgkw5=KxhXZHFs=mV8qq3du5gQHXQWFZQ@mail.gmail.com>
Date: Fri, 8 Nov 2024 08:20:15 -0500
From: Tamir Duberstein <tamird@...il.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/6] rust: types: avoid `as` casts

On Fri, Nov 8, 2024 at 8:15 AM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Fri, Nov 8, 2024 at 1:22 PM Tamir Duberstein <tamird@...il.com> wrote:
> >
> > guess the compiler derefs *mut T to *const T before the cast() to
>
> I guess you mean "coerces"? i.e. there shouldn't be a deref, no?

I was using "deref" in "deref coercion" sense:

https://doc.rust-lang.org/std/ops/trait.Deref.html#deref-coercion

But it seems that what's really going on is indeed automatic coercion
before the cast() call.