black formatter may change the content of string in nested f-strings

[koitococo]

Describe the bug

In Python 3.12, black formatter may change the content of string in nested f-strings

To Reproduce

For example, take this code:

def test(parts: list[str]):
    print(f"{"-".join(parts)}")

And run it with these arguments:

$ black test.py --target-version=py312 

The resulting error is:

contents changed to:

def test(parts: list[str]):
    print(f"{" - ".join(parts)}")

Expected behavior

contents of string should NOT change

Environment

• Black's version: 24.1.1 (compiled: yes)
• OS and Python version: [Fedora release 39/Python 3.12.1]

Additional context

[hauntsaninja]

Duplicate of #3746 (if you use Black's default settings, you get an error on this example, Black doesn't currently support PEP 701 at all)