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?

Brent Royal-Gordon

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