Bug report

Bug description:

https://github.com/python/cpython/blob/fd104dfcb838d735ef8128e3539d7a730d403422/Lib/concurrent/futures/_base.py#L26C1-L32

The _FUTURE_STATES variable hasn't been used in this file, and nor in other files: https://github.com/search?q=repo%3Apython%2Fcpython%20_FUTURE_STATES&type=code

And since it has an underscore prefix in the name, it's a private variable and won't be used by users.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-120157: Remove unused code in concurrent.future #120187