Forward impl declaration of an incomplete interface (#5168)

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Revise rules for what is required and provided by declarations and
definitions of interfaces and impls. In particular:

-   allow `impl` declarations of incomplete interfaces, and
- shift from a "use the information from the type definition if it
happens to be complete" model to a "only use the information from the
definition in contexts where it is required to be defined or complete"
model.

Resolves questions-for-leads issues
[#4566](https://github.com/carbon-language/carbon-lang/issues/4566),
[#4672](https://github.com/carbon-language/carbon-lang/issues/4672),
[#4579](https://github.com/carbon-language/carbon-lang/issues/4579).

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Co-authored-by: Josh L <josh11b@users.noreply.github.com>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>

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josh11b

2025-05-03 19:42:33 +00:00

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co-authored by Josh L Chandler Carruth Carbon Infra Bot

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