List of keywords searched before creating this issue:

C419

Minimal code snippet that reproduces the bug

# test.py
a = [1, 2]
print(sum([x for x in a]))
print(sum([x for x in a], 0))

Invoked command

Assuming test.py contains the content pasted above:

ruff check --preview test.py

Current Ruff settings

[tool.ruff.lint]
select = [
    "C419",
]

Current Ruff version

0.5.2

Description

Perhaps issues aren't supposed to be created for --preview warnings. If so, let me know.

The C419 warning will trigger for line 3 but not for line 4. I expected that it would trigger for both lines.