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Dana Jansens 057ef0d458 Orphan rule for scopes (#7140 )

Update the orphan rule to require a name to be defined within, or by,
the same scope as the impl declaration. Since libraries can not be
nested, this also enforces the old rule, but rejects more impl
declarations. In particular, it rejects an impl declaration in a generic
context which would have no way to provide a value for the generic
bindings it inherited from its enclosing scope, making the impl
unusable.

Discussed in open discussion
[2026-05-04](https://docs.google.com/document/d/1mjllGO3ZCL4qGt9uJHUtcxKoHAGEY7Y999ie4EtBWB8/edit?tab=t.3ifnhz83n73d#heading=h.p45zfugbmdih).

2026-06-02 22:33:15 +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

Orphan rule for scopes (#7140 )

2026-06-02 22:33:15 +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

Update examples throughout the design for p7016 (#7200 )

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