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ROS is already mostly in C++. I find it very enjoyable to use with C++. Python documentation and support is lacking, and Python 3 support is very recent. But yeah; ROS has problems and they don't have anything to do with the language. Saying "rebuild that in Rust" is missing the point. How does that address the parent's complaint which is Python support?

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my main reason for suggesting rust was to avoid the temptation to "solve the problem of the c++ build system ecosystem" which seems to be why catkin was created -- but i think this problem is basically intractable ...

Rust seems to me a reasonable language for developing the library of functionality that ROS offers -- with distribution and building and component development story all solved by the ecosystem default build mechanism ...

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