lol, UFCS was discussed in C++ before Rust even existed. Here's a paper from 2003 that mentions it: https://www.stroustrup.com/N1522-concept-criteria.pdf
the committee is pretty much against it so it won't get into "C++" though. but who cares, clang as a compiler already targets more platforms and has more eyeballs and development than most other languages anyways.
And of course rust people found a way to make this all about rust. I highly doubt the Clang devs are thinking "hmm we're really close to compiling rust but we just can't figure out UFCS." And C++ is not at all a sinking island.
I have recently been full time writing C++ and yes it is a sinking island. Don't worry, I assume just in time for C++ to migrate to Rust, Rust will also start sinking (and not because of the influx of C++).
Fine if new ways of calling things stem from new ways of declaring things, but then let's please name the feature after the root change rather than it's ramifications!
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On a different note. I am very excited for C++ to ape Rust features. Please keep doing it. The end result ought to be a lower marginal cost of Clang implementing Rust, in which case we can get really good C++ <-> Rust FFI....and migrate away from C++.
Please, build a bridge from the sinking island.