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Convert builtin "global" late lints to run per module The compiler currently has 4 non-incremental lints: 1. `clashing_extern_declarations`; 2. `missing_debug_implementations`; 3. ~`unnameable_test_items`;~ changed by https://github.com/rust-lang/rust/pull/114414 4. `missing_docs`. Non-incremental lints get reexecuted for each compilation, which is slow. Moreover, those lints are allow-by-default, so run for nothing most of the time. This PR attempts to make them more incremental-friendly. `clashing_extern_declarations` is moved to a standalone query. `missing_debug_implementation` can use `non_blanket_impls_for_ty` instead of recomputing it. `missing_docs` is harder as it needs to track if there is a `doc(hidden)` module surrounding. I hack around this using the lint level engine. That's easy to implement and allows to re-enable the lint for a re-exported module, while a more proper solution would reuse the same device as `unnameable_test_items`.
This directory contains some source code for the Rust project, including:
- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.