linux-kernel - Re: [PATCH v2] rust: alloc: allow coercion from `Box<T>` to `Box<dyn U>` if T implements U

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Message-ID: <Z_kUyx8ytlac1d__@cassiopeiae>
Date: Fri, 11 Apr 2025 15:10:35 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: 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>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rust: alloc: allow coercion from `Box<T>` to `Box<dyn
 U>` if T implements U

On Fri, Apr 11, 2025 at 09:07:26PM +0900, Alexandre Courbot wrote:
> This enables the creation of trait objects backed by a Box, similarly to
> what can be done with the standard library.
> 
> Suggested-by: Benno Lossin <benno.lossin@...ton.me>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>

I assume you have a specific use-case in nova-core for this? For this cycle, can
you get away without having this in nova-core?