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rustdoc: Replace `FakeDefId` with new `ItemId` type Follow up from #84707 `@Manishearth` [suggested](https://github.com/rust-lang/rust/pull/84707#issuecomment-831994669) that there should be a new `ItemId` type that can distinguish between auto traits, normal ids, and blanket impls instead of using `FakeDefId`s. This type is introduced by this PR. There are still some `FIXME`s left, because I was unsure what the best solution for them would be. Especially the naming in general now is a bit weird right now and needs to be cleaned up. Now there are no "fake" ids so the `is_fake` method on `Item` does not really make sense and maybe the methods on `ItemId` should be renamed too? Also, we need to represent the new item ids in the JSON backend somehow.
This directory contains the source code of the rust project, including:
- The test suite
- The bootstrapping build system
- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.