Black v24.4.1 & v24.4.2 fails to format f-strings containing multi-line strings

[gbatagian]

Black versions 24.4.1 and 24.4.2 encounter an issue when formatting Python code containing an f-string that includes a multi-line string. Example:

s = f"""{'''a
            b
            c'''}"""

print(s)

this is valid python syntax, as it is executable, but black cannot format it, as indicated below:

>>> cat black_sample.py 
s = f"""{'''a
            b
            c'''}"""

print(s)

>>> python --version
Python 3.12.1

>>> python black_sample.py 
a
            b
            c

>>> black --version
black, 24.4.2 (compiled: yes)
Python (CPython) 3.12.1

>>> black black_sample.py 
error: cannot format black_sample.py: Cannot parse: 1:9: s = f"""{'''a

Oh no! 💥 💔 💥
1 file failed to reformat.

[hauntsaninja]

I think this was fixed by #4339 , we should cut a release with it soon