linux-kernel - Re: [PATCH v2 05/12] rust: init: make initializer values inaccessible after initializing

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Date:   Wed, 19 Jul 2023 16:07:56 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Benno Lossin <benno.lossin@...ton.me>,
        Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Andreas Hindborg <nmi@...aspace.dk>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/12] rust: init: make initializer values inaccessible
 after initializing

On 7/19/23 11:20, Benno Lossin wrote:
> Previously the init macros would create a local variable with the name
> and hygiene of the field that is being initialized to store the value of
> the field. This would override any user defined variables. For example:
> ```
> struct Foo {
>      a: usize,
>      b: usize,
> }
> let a = 10;
> let foo = init!(Foo{
>      a: a + 1, // This creates a local variable named `a`.
>      b: a, // This refers to that variable!
> });
> let foo = Box::init!(foo)?;
> assert_eq!(foo.a, 11);
> assert_eq!(foo.b, 11);
> ```
> 
> This patch changes this behavior, so the above code would panic at the
> last assertion, since `b` would have value 10.
> 
> Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
> ---
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>