[PR #13502/01dce85a backport][8.4.x] Fix compatibility with Twisted 25#13531
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nicoddemus merged 1 commit into8.4.xfrom Jun 17, 2025
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As discussed in #13502, the fix for compatibility with Twisted 25+ is simpler. Therefore, it makes sense to implement both fixes (for Twisted 24 and Twisted 25) in parallel. This way, we can eventually drop support for Twisted <25 and keep only the simpler workaround. In addition, the `unittestextras` tox environment has been replaced with dedicated test environments for `asynctest`, `Twisted 24`, and `Twisted 25`. Fixes #13497 (cherry picked from commit 01dce85)
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This is a backport of PR #13502 as merged into main (01dce85).
The issue arises because
Failure.__init__in Twisted 25 can receive a non-Noneexc_valuewhileexc_tbisNone. In such cases,ExceptionInfo[BaseException].from_exc_infofails, as it expects a traceback to be present whensys.exc_info()returns a tuple. This leads to the error message'NoneType' object is not iterable.Implemented separate workarounds for Twisted 24 and Twisted 25, the later one being simpler and less intrusive in the long run, as it does not require monkeypatching
Failure.__init__.We can drop suppor for Twisted 24 and keep the simpler patch in a later release.
Fixes #13497