rust-lang / rust-lang/rustfmt

`cargo fmt` does not do anything in tokio repo

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Description

I found this problem locally and wondered how tokio was checking formatting in CI.

As you can see they are calling rustfmt directly:
https://github.com/tokio-rs/tokio/blob/master/ci/azure-rustfmt.yml#L17

This comment links to a cargo issue:
https://github.com/rust-lang/cargo/issues/7732

However, this cargo issue is closed and it's not clear how it's related.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with tokio's ci/azure-rustfmt.yml at the referenced line and compare its direct rustfmt invocation with cargo fmt. Read the linked cargo issue #7732 to determine whether it explains the behavior. Done requires a clear explanation of why cargo fmt does nothing in this repository and what, if anything, should change.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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