Re: [PATCH 04/13] Kbuild: Rust support

[Miguel Ojeda]

On Fri, Apr 16, 2021 at 10:22 PM Willy Tarreau <w@xxxxxx> wrote:
>
> So it simply does the equivalent of:
>
>   struct result {
>      int status;
>      int error;
>   };

Not exactly, it is more like a tagged union, as Connor mentioned.

However, and this is the critical bit: it is a compile-time error to
access the inactive variants (in safe code). In C, it is on you to
keep track which one is the current one.

>      kill_foo();   // only for rust, C doesn't need it

Please note that `kill_foo()` is not needed in Rust -- it was an
example of possible cleanup (since Al mentioned resources/cleanup)
using RAII.

Cheers,
Miguel