Rollup merge of #157443 - JonathanBrouwer:crate-level-err, r=mejrs Make distinction between crate-level attributes that are warned vs errored r? @mejrs This is a follow-up to https://github.com/rust-lang/rust/pull/157377#discussion_r3352077154 This PR makes all unstable crate-level attributes error on incorrect targets. To make the diff more helpful, I'd recommend reviewing the two commits separately. * The first commit introduces the infra & makes all crate-level attributes a warning, the commit should have no effect * The second commit undoes some changes from the first commit, to make all unstable crate-level attributes error
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