Extern rust fun type checking #1168
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Just a mechanical rename, no other changes. This is because in a future commit we will start to identify some errors that emanate from Rust code and we want to treat them differently, as we can attach span information to them.
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Previously extern_rust_function support was highly basic and didn't usually work at all. This change improevs matters: * it allows us to emit errors with miette diagnostics from this part of the codebase, giving spans in case of trouble * it validates that the parameters to such a function are valid to be used by cxx, as is the return type * it detects types used as parameters and return type and ensures they are not garbage collected elsewhere in autocxx * it adds a code example. * we remove a field from RustFun which we didn't actually need and replace it with a simple Boolean. Builds on test case from #1166 (thanks!) and there's a bit of discussion in #1167.
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Relates to #1166.