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Nothing about LLVM makes Swift inherently cross-platform. LLVM bitcode is not target independent.

I'm not sure I understand the relevance? Neither are rust libraries.

Not sure about exposing Swift to C itself, while Rust has a clear "call from C" story.

I think that's what was referred to.

Sure - this may be me more appealing if you prefer Rust as a language or wrote some existing code in it but still want to be able to target iOS.