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Not sure about the nature of the generated code, but wouldn’t doing the equivalent of dynamic linking mitigate this problem?

How can you get around Rust's lack of a stable ABI?

The same way as in other ecosystems that lack it, compile everything with the same toolchain.

And then you have to recompile everything every time you upgrade the toolchain.

Which is what you already have to do in Rust anyway, as the compilation hashes are bound to the toolchain.