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Document that the crate keyword refers to the project root 👋 this is my first rust contribution so I hope I'm doing everything correctly. Help very much appreciated if I'm not. As far as I can tell this use of `crate` is only documented [in the edition guide for rust 2018](https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html#the-crate-keyword-refers-to-the-current-crate). However it should probably be in the documentation for the `crate` keyword itself. This adds that documentation.
This directory contains the source code of the rust project, including:
rustcand its testslibstd- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc guide.
There is also useful content in the following READMEs, which are gradually being moved over to the guide:
- https://github.com/rust-lang/rust/tree/master/src/librustc/ty/query
- https://github.com/rust-lang/rust/tree/master/src/librustc/dep_graph
- https://github.com/rust-lang/rust/tree/master/src/librustc/infer/higher_ranked
- https://github.com/rust-lang/rust/tree/master/src/librustc/infer/lexical_region_resolve