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> To be clear, I like Rust. I've been following it for years, and I'm disappointed that it's not an adequate replacement for C++

Just out of curiosity, what is it about Rust that means it's an inadequate replacement for C++?

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There are many things you could dismiss as style issues, but here is one relating to performance. Rust does not (yet) have integer generics. If I use Eigen (the C++ library), I can declare a matrix of size 6x9 and have the allocation live (cheaply) on the stack. I do this kind of thing frequently (not always 6x9), and in Rust I would pay for heap allocated matrices. The cost in performance can be huge. Maybe this will get fixed in the near future.

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