Who wrote Py_UNREACHABLE?

[Chris Angelico]

On Mon, Jan 3, 2022 at 3:19 AM Marco Sulla <Marco.Sulla.Python at gmail.com> wrote:
>
> #if defined(RANDALL_WAS_HERE)
> #  define Py_UNREACHABLE() \
>     Py_FatalError( \
>         "If you're seeing this, the code is in what I thought was\n" \
>         "an unreachable state.\n\n" \
>         "I could give you advice for what to do, but honestly, why\n" \
>         "should you trust me?  I clearly screwed this up.  I'm writing\n" \
>         "a message that should never appear, yet I know it will\n" \
>         "probably appear someday.\n\n" \
>         "On a deep level, I know I'm not up to this task.\n" \
>         "I'm so sorry.\n" \
>         "https://xkcd.com/2200")
> #elif defined(Py_DEBUG)
> #  define Py_UNREACHABLE() \
>     Py_FatalError( \
>         "We've reached an unreachable state. Anything is possible.\n" \
>         "The limits were in our heads all along. Follow your dreams.\n" \
>         "https://xkcd.com/2200")
>
> etc

Zachary Ware, 2019-09-12, commit #3ab614
https://github.com/python/cpython/pull/16032

ChrisA