ruff format output breaks certain f-strings in 0.9

[markjm]

Consider the file:

params = {}
string = "this is my string with " f'"{params.get("mine")}"'

ruff format in 0.9.1 replaces this to

ruff format test.py --diff
--- test.py
+++ test.py
@@ -1,2 +1,2 @@
 params = {}
-string = "this is my string with " f'"{params.get("mine")}"'
\ No newline at end of file
+string = f"this is my string with \"{params.get("mine")}\""

1 file would be reformatted

This is not valid python due to nested f-string using the same quote character (at least, its not valid before py3.12

python -m compileall test.py
Compiling 'test.py'...
***   File "test.py", line 2
    string = f"this is my string with \"{params.get("mine")}\""
                                                     ^
SyntaxError: invalid syntax

It is a very uncommon case and simple enough to just fix up myself, but figured id bug report to make yall aware.

Thanks for the great project!

[MichaReiser]

I'm able to reproduce this but only when using quote-style = "preserve". Using either single or double works fine (playground)

[markjm]

Sorry, forgot to include my config!

[MichaReiser]

No worries. The issue contained enough details that I could figure it out myself. Thanks for reporting