Implement restrictions, prepare for stabilization

[nikomatsakis]

Metadata
Point of contact	@jhpratt
Team(s)	compiler, lang, spec
Goal document	2025h1/restrictions

Summary

[RFC 3323][rfc] will be implemented and feature-complete, with all syntax questions resolved. The
features will be prepared for stabilization.

Tasks and status

• Discussion and moral support (lang )
• Implementation (@jhpratt)
• Standard reviews (compiler )
• Author stabilization report (@jhpratt)
• Author specification 1st draft (@jhpratt)
• Finalize specification text (spec )
• Stabilization decision (lang )
• Inside Rust blog post inviting feedback (@jhpratt)

[nikomatsakis]

This issue is intended for status updates only.

For general questions or comments, please contact the owner(s) directly.

[jhpratt]

First status update:

No progress. I will be reviewing the existing PR this weekend to see the feasibility of rebasing it versus reapplying patches by hand. My suspicion is that the latter will be preferable.