Black produced different code on the second pass of the formatter

[cjfuller]

Describe the bug

While running black, I get the error message INTERNAL ERROR: Black produced different code on the second pass of the formatter. Please report a bug on https://github.com/psf/black/issues.

To Reproduce

1. Start with https://github.com/cjfuller/M33-Fio/blob/9ac4a36ebc1433294d3e28b5dfbc8be89036c2bb/octoprint_m33fio/__init__.py
2. run black octoprint_m33fio/__init__.py (from a checkout of the root of that repository)
3. get the above error message, with a diff linked. Gist for the diff it outputs (it's a ~31k line diff unfortunately, so I didn't inline it).

Expected behavior

I expected it to format the file without error.

Environment (please complete the following information):

• Version: 20.8b1
• OS and Python version: MacOS 11.2, Cpython 3.8.2

Does this bug also happen on master?
yes (via local clone / installation)

Additional context

Apologies for the report that is so far from a minimal repro; I'm attempting to resurrect someone else's abandoned and unusually formatted project, so there's a ton of code that needs formatting. I figured I'd report it anyway, since it said to do so, but if this isn't useful, please just ignore. The "run twice with --fast" trick fixes it so this is easy to work around.

[jeffrey-cochran]

I just experienced the same bug.

[ichard26]

Hello!

All reproduction cases in this issue format without error on master. The fixing commit was 8672af3 from PR GH-2126. I'll be marking this issue as a duplicate of GH-1629 since that's what GH-2126 aimed to fix and it's highly likely this issue falls under GH-1629.

Since we use the issue tracker as a reflection of what's on master, I'll be closing this issue. If you have any issues, especially with the new (but stable) output, please open a new issue. Oh and the fix should be available in a published release soon, see GH-2125 for more info.

Thank you for reporting!