Why not Go? It's more portable.
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I see people complaining about Rust's lack of portability, and it is always some obsolete platform that has been dead for 20 years. Let's be serious, nobody is gonna run Tor on an old SGI workstation or Itanium server.
In all seriousness, I guess you can make this argument if you only care about Windows/macOS, but the moment you run anything else I have to ask why, say, Linux deserves support but not other less-common platforms.