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reflection and comptime #406

@nikomatsakis

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@nikomatsakis
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Point of contact @oli-obk
Team(s) compiler, lang, libs
Goal document 2025h2/reflection-and-comptime

Summary

Design, implement and experimentally land a reflection scheme based on const fn that can only be called at compile time.
This proposal is solely for producing const eval values, not for putting types back into the type system.
That will be a follow-up once this proposal has a merged MVP.

Tasks and status

  • Discussion and moral support (lang Team)
  • Do the work ()

Design language feature to solve problem

Implement language feature

  • Implementation ()
  • Standard reviews (compiler Team)
  • Design meeting (lang Team)
  • Author call for testing blog post

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