Tracking Issue for Rust 2024: rustfmt single line where clauses

[calebcartwright]

This is a tracking issue for changing the formatting of where clauses to be formatted on a single line in some additional contexts, provided they meet certain constraints (short, single bound, and no = on aliases)

About tracking issues

Tracking issues are used to record the overall progress of implementation. They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions. A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature. Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.

Steps

• [ ] Implement in nightly Rust 2024.
• [ ] Add documentation to the edition guide.
• [ ] Add formatting for new syntax to the style guide.
  • See the nightly style procedure.
  • https://github.com/rust-lang/rust/pull/119515
• [ ] Ensure ready for Rust 2024 stabilization.

Unresolved Questions

None.

Implementation history

• https://github.com/rust-lang/rust/pull/119515

cc @rust-lang/rustfmt @rust-lang/style

[calebcartwright]

Similar to my comment in https://github.com/rust-lang/rust/issues/132380#issuecomment-2448894537, I will note that we have already done the development for this and have been testing and reviewing the testing results with the style team.

Going to keep the impl-incomplete label until implementation is merged though