INTERNAL ERROR: Black produced different code on the second pass of the formatter. -- long line with comparison to set subtraction of 2 sets

[AlbertoEAF]

Describe the bug

The following code is enough to trigger the bug:

e = dict()

assert {} == {"inputs", "outputs", "pipeline_execution_id", "results", "state", "task_config", "task_config_id", "id", "started_at", "updated_at", "finished_at"} - set(e[0].keys())

The bug doesn't show up if I either:

• Use the right hand side (RHS) of the comparison alone.
• Wrap the RHS in parenthesis.

Environment (please complete the following information):

• Version: 20.8b1
• OS and Python version: Ubuntu 18.04, clean virtual env with python3.7 + black

Does this bug also happen on master?

Yes

[mvolfik]

Works with #1958, so likely a duplicate of #1629

[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!