# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2019-10-21 21:26:29 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1186393341971353600) RT @bsaeta: The #S4TF team is collaborating with @tkremenek and the core #SwiftLang team to upstream language-integrated automatic differen…