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Chandler CarruthandGeoff Romer 6e6405c0bb Replace :! and :? with keywords and contextual defaults (#7254 )

This proposal removes the `:!` syntax for generics and templates in
favor of keywords (`generic`, `template`, `runtime`) and contextual
defaults for phase. It also replaces `:?` with `fwd` and introduces
`exttype` for extended types.

Assisted-by: Antigravity with Gemini, and Claude

---------

Co-authored-by: Geoff Romer <gromer@google.com>

2026-06-29 22:51:57 +00:00

appendix-coherence.md

Update examples throughout the design for p7016 (#7200 )

2026-05-13 18:42:55 +00:00

appendix-rewrite-constraints.md

Update examples throughout the design for p7016 (#7200 )

2026-05-13 18:42:55 +00:00

appendix-witness.md

Update examples throughout the design for p7016 (#7200 )

2026-05-13 18:42:55 +00:00

details.md

Switch from Prettier to Rumdl for Markdown formatting (#7423 )

2026-06-26 21:42:01 +00:00

goals.md

Update broken links (#3786 )

2024-03-22 18:42:20 +00:00

overview.md

Update examples throughout the design for p7016 (#7200 )

2026-05-13 18:42:55 +00:00

README.md

Updates to generics design details, part 2 (#3253 )

2023-10-03 00:03:07 +00:00

terminology.md

Replace :! and :? with keywords and contextual defaults (#7254 )

2026-06-29 22:51:57 +00:00

README.md

Generics

This directory contains the collection of documents describing the generics feature of Carbon:

Overview - A high-level description of the generics design, with pointers to other design documents that dive deeper into individual topics
Goals - The motivation and principles guiding the design direction
Terminology - A glossary establishing common terminology for describing the design
Detailed design - In-depth description
- Appendix: Coherence - Describes the rationale for Carbon's choice to have coherent generics, and the alternatives.
- Appendix: Rewrite constraints - Describes the detailed rules governing rewrite constraints, and why resolving them terminates.
- Appendix: Witness tables - Describes an implementation strategy for checked generics, and Carbon's rationale for only using it for dynamic dispatch.