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The relatively low portability of rust programs is definitely one of its largest shortcomings.

Can you elaborate? Although haven't tried it myself, I was under the impression that it's quite possible to write low level code for at least for x86 and ARM (and AVR?).

You can write low level code. Tier 1 platform list is very short however.

https://forge.rust-lang.org/platform-support.html

It's probably unreasonable to expect a wide variety of IoT platforms to meet the "automated testing" requirement for Tier 1 status.

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