[pjmlp]

async, yeah it could be better, given the pains. However note that adding async to .NET and C++ hasn't been a panacea either, to the point that there is a prototype of adding Go/Java green threading to .NET, done by the .NET team. While with the C++ standard library there isn't an executor runtime in the box.

Lifetimes are painful, and a other languages are exploring better ergonomics or combining automatic memory management with affine/linear types, yet it was Rust's adoption that pushed other language designers to actually look into this. So from that point of view, quite a success, even if Rust vanishes tomorrow.