Good question, I'll update the post if I can figure it out. It turns out that swift uses both witness and virtual tables, something I'm realizing I didn't make

Good question, I'll update the post if I can figure it out. It turns out that swift uses both witness and virtual tables, something I'm realizing I didn't make very clear in the post. https://github.com/apple/swift/blob/master/docs/SIL.rst#vtables https://github.com/apple/swift/blob/master/docs/SIL.rst#vtab... has some more interesting information.