Message 250927 - Python tracker

> Martin Panter added the comment:
> 
> Another strange error message (though maybe the new test changes you mentioned caught this):
> 
>>>> f'{3:{10}'  # Actually missing a closing bracket '}'
>   File "<stdin>", line 1
> SyntaxError: f-string: unexpected '}'

Yes, I found that one, too. Sorry to waste your time on this, but I literally just finished the test changes 15 minutes ago.