Little by little, Rust, like D, acknowledges that C++ flexibility regarding object construction, copy and move, even if too much as a default, is sometimes needed :)
I saw in D years ago how they also checked into this flexibility after getting some use cases for it (in this case, copying): https://github.com/dlang/DIPs/blob/master/DIPs/accepted/DIP1...
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This is the opposite, it is further opting out of flexibility.
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D is my favorite language that I wish I could use more, but the chances of me being paid to use it are too low, I wish that job market would expand, I feel like D needs a really good alternative to Vibe.d a web framework with a well designed ORM, or a rich GUI stack out of the box. Go became massive because a production ready but simple HTTP server came out of the box, and other nice to haves that made being productive in Go a breeze from day 1.
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To be clear, this is absolutely not adding any sort of C++-style overrideable implicit move or copy constructor to Rust. There's not really any relationship to C++ in this proposal, it's just a step towards opt-in linear types.
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