linux-kernel - Re: [PATCH 5/5] rust: error: Add from_kernel

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Date:   Sun, 26 Feb 2023 14:40:44 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Gary Guo <gary@...yguo.net>, Asahi Lina <lina@...hilina.net>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Fox Chen <foxhlchen@...il.com>, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, asahi@...ts.linux.dev
Subject: Re: [PATCH 5/5] rust: error: Add from_kernel_result!() macro

On Sun, Feb 26, 2023 at 3:22 AM Boqun Feng <boqun.feng@...il.com> wrote:
>
> Hmm.. looks like the `?` only "propagating them (the errors) to the
> calling *function*":
>
>         https://doc.rust-lang.org/reference/expressions/operator-expr.html#the-question-mark-operator
>
> , so this doesn't work as we expect:
>
>         https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=64c9039e1da2c436f9f4f5ea46e97e90
>
> Hope I didn't miss something subtle here..

There is `feature(try_blocks)` [1] for that:

    https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=8f40663d2ad51e04a13f2da5c4580fc0

[1] https://github.com/rust-lang/rust/issues/31436.

Cheers,
Miguel