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Rust doesn't have a stable ABI for things that can't be expressed in C, so I assume he means when you're screwed when you want to publish Rust-specific interfaces to a shared library.

This is one area where Swift is far ahead of Rust, at least for now.

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The stable ABI is really tricky. Another pointer from another talk was about how stabilizing ABI might reduce the performance hash functions (which is used by the compiler) by 0.5%. So, it is really a tricky decision to make that involves doing the right tradeoff at the right point in time.

I'm convinced that a COM-like solution with support for concepts that Rust/Swift have will be the sweet spot.

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