Introduction of whitespace after while and assignment operator

[OJFord]

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

black produces this diff:

-            while (foo := self._some_method(arg)):
+            while (foo := self._some_method(arg)) :

To Reproduce Steps to reproduce the behavior:

1. Create a file repro.py:

while (foo := self._some_method(arg)):
    pass

2. black repro.py ; cat repro.py
3. Observe output:

reformatted repro.py
All done! ✨ 🍰 ✨
1 file reformatted.
while (foo := self._some_method(arg)) :
    pass

Expected behavior

All done! ✨ 🍰 ✨
1 file left unchanged.
while (foo := self._some_method(arg)):
    pass

Environment (please complete the following information):

• Version: 20.8b1
• OS and Python version: Darwin Kernel Version 20.2.0 & Python 3.9.1

Does this bug also happen on master?

No.

Additional context

[ichard26]

This was fixed in commit 1d2d726 from PR #1655: ''Fix incorrect space before colon in if/while stmts". This issue is technically a duplicate of #1588 but I'll leave this open until a release ships with the fix mentioned above.

[ichard26]

And there has been quite a few releases since my comment above so definitely closing now. Thank you for the report!