I had a proposal for replacing/reintroducing `ExpressibleByStringInterpolation`
(which is currently deprecated pending a redesign), but it landed too late in
the Swift 4 cycle to be considered. The PR is here:
I think it squares up relatively well against the Swift 5 standards:
* It addresses ABI stability and strings, which are both Swift 5 themes.
* It includes an implementation, but it definitely needs a rebase, probably
needs someone more experienced than me to examine it with a fine-toothed comb,
and might need a significant redesign.
* I believe it includes tests.
* I don't think it's been run against the source compatibility suite. (Is there
a way for random outside developers to do that?)
So what's the next step at this point?
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