https://bugzilla.wikimedia.org/show_bug.cgi?id=72669
Merlijn van Deen valhallasw@arctus.nl changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |valhallasw@arctus.nl Resolution|--- |INVALID
--- Comment #2 from Merlijn van Deen valhallasw@arctus.nl --- That statement: 1) never has existed in core, as catlib doesn't exist there, 2) has been removed in compat in this revision: https://github.com/wikimedia/pywikibot-compat/commit/fcaa349e54e7850e555b878...
So you probably copied an ancient revision of compat interwiki.py into d:\py\rewrite or d:\py\rewrite\scripts.