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Remove `missing_docs` lint on private 2.0 macros https://github.com/rust-lang/rust/blob/798baebde1fe77e5a660490ec64e727a5d79970d/compiler/rustc_lint/src/builtin.rs#L573-L584 This code is the source of #57569. The problem is subtle, so let me point it out. This code makes the mistake of assuming that all of the macros in `krate.exported_macros` are exported. ...Yeah. For some historical reason, all `macro` macros are marked as exported, regardless of whether they actually are, which is dreadfully confusing. It would be more accurate to say that `exported_macros` currently contains only macros that have paths. This PR renames `exported_macros` to `importable_macros`, since these macros can be imported with `use` while others cannot. It also fixes the code above to no longer lint on private `macro` macros, since the `missing_docs` lint should only appear on exported items. Fixes #57569.