As per zope.interface 4.0.0 changelog
- Deprecate the “class advice” APIs from zope.interface.declarations: implements, implementsOnly, and classProvides. In their place, prefer the equivalent class decorators: @implementer, @implementer_only, and @provider. Code which uses the deprecated APIs will not work as expected under Py3k.
PR incoming, patch is simply output of zope-2to3 -wn lib/py/src/transport/TTwisted.py