Actually, I found it's rejected PEP:
https://www.python.org/dev/peps/pep-3136/.

It looks like the first of several ideas there matches my ad hoc syntax. It
*was* 2007, in distant pre-walrus memory. But I'm not sure the SC would
revisit Guido's ruling.

On Wed, Dec 4, 2019, 6:45 PM Andrew Barnert via Python-ideas <
python-ideas@python.org> wrote:

> On Dec 4, 2019, at 12:14, Mike Miller <python-id...@mgmiller.net> wrote:
> >
> > 
> >> On 2019-12-04 11:05, David Mertz wrote:
> >> I've often wanted named loops. I know approaches to this have been
> proposed many times, and they all have their own warts. E.g. an ad hoc
> pseudo code that may or may not match any previous proposal:
> >> for x in stuff as outer:
> >>     for y in other_stuff as inner:
> >>         ...
> >>         if cond:
> >>             break outer
> >> But we all manage without it.
> >
> > +1  Nice, find myself with that problem about once a year and it is
> annoying to code around
>
> If you want to change this from an aside to a real proposal, it’s probably
> worth starting a new thread (and providing a real-life use case—if we all
> run into it once a year, many people probably won’t remember exactly what
> it looked like when they last ran into it, and how much their workaround
> bothered them).
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