Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <41d543d4-ab21-d10f-f484-4d5360fed7c2@gmail.com>
Date:   Wed, 19 Jul 2023 16:07:56 -0300
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v2 05/12] rust: init: make initializer values inaccessible
 after initializing
Content-Language: en-US
To:     Benno Lossin <benno.lossin@proton.me>,
        Miguel Ojeda <ojeda@kernel.org>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>
Cc:     Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Alice Ryhl <aliceryhl@google.com>,
        Andreas Hindborg <nmi@metaspace.dk>,
        rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230719141918.543938-1-benno.lossin@proton.me>
 <20230719141918.543938-6-benno.lossin@proton.me>
From:   Martin Rodriguez Reboredo <yakoyoku@gmail.com>
In-Reply-To: <20230719141918.543938-6-benno.lossin@proton.me>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

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@proton.me>
> ---
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>