Tracking issue for RFC 3678: Trait method impl restrictions (`final` methods)

This is a tracking issue for RFC 3678: Trait method impl restrictions (final methods).

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

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

• Approve as lang experiment.
  • (Approved implicitly given the circumstances.)
• Accept an RFC.
  • https://github.com/rust-lang/rfcs/pull/3678
• Implement in nightly.
  • (https://github.com/rust-lang/rust/pull/130802)
  • https://github.com/rust-lang/rust/pull/151783
• 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.
  • See the instructions.

Unresolved Questions

• https://github.com/rust-lang/rust/issues/153649 (Resolved)
• https://github.com/rust-lang/rust/issues/160552

Related

TODO.

Start with the stabilization guide linked in the issue, then review the dev guide, Reference contributing instructions, and nightly style procedure. Determine the documentation, reference, and formatting work still required for RFC 3678, and review unresolved issue 160552. Done means the unchecked documentation and style tasks are completed and the feature is ready for stabilization.