Comment by quux

Andreas has looked deeply into moving both SerenityOS and Ladybird to a successor language but at the time didn't find anything out there that met their requirements so he started a new language named Jakt which unfortunately never got enough traction to move to.

One of the issues preventing them from adopting a language like Rust or Swift was the large number of 3rd party dependencies they would bring with them, this went against the "we build everything from scratch" ethos of SerenityOS. Now that Ladybird is forked from Serenity I hope they can revisit this decision.

It wouldn't surprise me if they adopt Swift. Andreas really liked it and in the time since it was last evaluated Swift's C++ interop has improved a lot.