Failure to format complex assert statement

[jmfrees]

Describe the bug A clear and concise description of what the bug is.

Black fails to format complex assert statement.

To Reproduce Steps to reproduce the behavior:

1. Take a file black_bug.py with contents

import json

def problem_function():
    assert foo(
        json.dumps(some_decently_long_variable_name), long_dict_name["baz"], last_variable
    ) == (False, True, [other_dict["somekey"]])

2. Run Black on it with no args, black black_bug.py
3. See error

error: cannot format black_bug.py: INTERNAL ERROR: Black produced different code on the second pass of the formatter.  Please report a bug on https://github.com/psf/black/issues.  This diff might be helpful: /tmp/blk_cjwvmatg.log
Oh no! 💥 💔 💥
1 file failed to reformat.

Expected behavior A clear and concise description of what you expected to happen.

Format file without error

Environment (please complete the following information):

• Version: 20.8b1
• OS and Python version: Arch Linux x86_64/Python 3.9.3

Does this bug also happen on master? To answer this, you have two options:
Yes, this occurs on master as seen here.

Additional context Add any other context about the problem here.

If you shorten anything on the line of the arguments for foo (line 5 in the code block above) by one or two characters, black formats correctly.

[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!