[jmull]

> Swift 5 (Early 2019): > binary compatibility with future Swift releases

I bet this doesn't really happen, though it probably makes the day when it really happens closer.

(I don't just mean they might miss the date, but that (1) they miss the date by a lot; and/or (2) they drop binary compatibility from Swift 5; and/or (3) they claim they've achieved binary compatibility but it doesn't out to be true for long, less than 5 years )

[Osmium]

They do provide a public dashboard for tracking progress to ABI stability: https://swift.org/abi-stability/

Whether it turns out there are things missing from that list, who knows, but they're definitely getting closer.

[Apocryphon]

It was already promised in Swift 4 and delayed to 5, you think it will continue to slip?

[s73v3r_]

Binary compatibility means a certain level of commitment to support that the Swift team seems to have avoided.