Tracking issue for RFC 3722: Explicit ABIs in `extern`

This is a tracking issue for:

• https://github.com/rust-lang/rfcs/pull/3722

The feature gate for the issue is #![feature(explicit_extern_abis)].

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

• Accept an RFC.
  • https://github.com/rust-lang/rfcs/pull/3722
• Add migration lint.
  • https://github.com/rust-lang/rust/pull/132357
• Make and FCP the change to warn-by-default in all editions.
  • https://github.com/rust-lang/rust/pull/132397
• Make this a hard error in the next edition on nightly under a feature flag.
  • Blocked on finalizing the name and timing of the next edition.
  • https://github.com/rust-lang/rust/pull/135340
• Add documentation to the dev guide.
  • See the instructions.
• Add documentation to the reference.
  • See the instructions.
• Add formatting for new syntax to the style guide.
  • See the nightly style procedure.
• Stabilize on nightly on the next edition.
  • See the instructions.

Unresolved Questions

None.

Related

TODO.

Implementation history

TODO.

Start with the linked RFC 3722 and the rustc-dev-guide stabilization instructions, then review the remaining checklist items for dev guide, reference, and style-guide documentation. The work is done when the outstanding documentation and formatting tasks are completed and the feature reaches the listed stabilization step; the next-edition error remains blocked by edition naming and timing.