You can't fathom the immense joy this brings me.
I have been dreaming about this for quite some time. Next to my iOS and Linux work, I'm doing my development on the ESP (Tensilica + RISCV) family with C(++) – being able to use Swift (and possibly share libraries) there would be heaven.
But not only that, I would imagine that this work would also lead to performance improvements on the desktop systems, so I'm all for it!