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Gate `repr(Rust)` correctly on non-ADT items #114201 added `repr(Rust)` but didn't add any attribute validation to it like `repr(C)` has, to only allow it on ADT items. I consider this code to be nonsense, for example: ``` #[repr(Rust)] fn foo() {} ``` Reminder that it's different from `extern "Rust"`, which *is* valid on function items. But also this now disallows `repr(Rust)` on modules, impls, traits, etc. I'll crater it, if it looks bad then I'll add an FCW. --- https://github.com/rust-lang/rust/labels/relnotes: Compatibility (minor breaking change).