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With Go basic stuff like url parsing or HTTPS support is written in Go and comes with the standard library. With Rust too many necessary things are just wrappers around C and C++ making cross-compilation and reproducible builds much harder to archive.

As for availability if CGO is ok, then calling C or C++ code from Go is not that hard. Also, there is always an option to just start C++ process if extra data copies are OK.

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C APIs are much more annoying to wrap in Go than in Rust because of lack of enums (important) and unions (less important).
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Nonsense, Rust has plenty of native libraries for HTTP and JSON.
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Has there been a lot of progress with ML in Rust? I don't really keep up with it because it seems like every crate ends up getting abandoned and I just gave up caring.
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