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Miri only works on Rust code - it can "see" neither C nor Objective-C code! But, if we had an Objective-C runtime written in Rust (something I've been considering doing for fun anyhow), and wrote a few shims for the most common objects, we could have something quite serviceable for testing the soundness (and other properties that Miri can check) of
objc2
and crates using it.Would be very useful to have for finding issues in our implementation (like in upstream SSheldon/rust-objc#112), but requires a lot of work, so probably isn't going to happen anytime soon, if at all.