Re: [PATCH v8 5/7] rust: str: add radix prefixed integer parsing functions

[Andreas Hindborg <a.hindborg@kernel.org>]

"Miguel Ojeda" <miguel.ojeda.sandonis@gmail.com> writes:

> On Thu, Feb 27, 2025 at 3:39 PM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>>
>> +                    // SAFETY: We checked that `val` will fit in `Self` above.
>> +                    let val: Self = unsafe { val.try_into().unwrap_unchecked() };
>
> This is wrong -- `val` can be the maximum, and thus it does not fit
> since it is 2's complement, even if later the complement would.
>
> In fact, it is caught by the doctest when run with debug assertions enabled:
>
>    /// assert_eq!(Ok(-128), i8::from_str(b_str!("-128")));
>
> We try to put 128 into `i8`, which of course does not work...

Thanks for catching this! I have to start running tests with debug
assertions, it makes no sense not to do so.

I'll send a new version now, hope it will make the cut.


Best regards,
Andreas Hindborg