ebdf2abea4
lint ImproperCTypes: refactor linting architecture (part 1) This is the first PR in an effort to split rust-lang/rust#134697 into individually-mergeable parts. This one focuses on properly packaging the lint and its tests, as well as properly separate the "linting" and "type-checking" code. There is exactly one user-visible change: the safety of `Option<Box<FFISafePointee>>` is now the same in `extern` blocks and function definitions: it is safe. r? `@tgross35` because you are already looking at the original
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