Files
rust/src
bors 04e69e4f42 Auto merge of #66691 - dtolnay:fmt0, r=sfackler
Format libcore with rustfmt

I am interested in whether we can begin cautious incremental progress on #66688 and assess along the way whether we can keep the disruption sufficiently small.

This PR applies rustfmt with default settings to files in src/libcore *that are not involved in any currently open PR* to minimize merge conflicts. The list of files involved in open PRs was determined by querying GitHub's GraphQL API  [with this script](https://gist.github.com/dtolnay/aa9c34993dc051a4f344d1b10e4487e8).

With the list of files from the script in `outstanding_files`, the relevant commands were:

```console
$ find src/libcore -name '*.rs' | xargs rustfmt --edition=2018
$ rg libcore outstanding_files | xargs git checkout --
```

Repeating this process several months apart should get us coverage of most of the rest of libcore.
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This directory contains the source code of the rust project, including:

  • rustc and its tests
  • libstd
  • Various submodules for tools, like rustdoc, rls, etc.

For more information on how various parts of the compiler work, see the rustc guide.