Rust for safety-critical software

I guess a couple companies are working to qualify Rust compiler and certify the automotive safety-critical software. Not sure how they go about doing it in the absence of any official language specification. Anyone?

IIUC Ferrocene's approach was to downstream rustc and spec that. It has been qualified. I don't know about others.

Here is Rust's own spec tracking issue.

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There is a talk on YouTube about how Ferrocene did this: https://m.youtube.com/watch?v=_ITnWoPvMKA

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