Auto merge of #157094 - khyperia:UnevaluatedConstKind, r=BoxyUwU

introduce UnevaluatedConstKind

(no rush on this, boxy, if you get this notif, I know you're on break after rustweek)

Partially fixes https://github.com/rust-lang/project-const-generics/issues/98

- does not unify GCE `ConstKind::Expr` into Unevaluated, which is part of that issue
- does not do more advanced refactoring to take advantage of the new kind repr, only refactoring when things are very obviously able to take advantage
- does not change MIR's UnevaluatedConst to use UnevaluatedConstKind, as there's currently no benefit, and doing so instead overcomplicates many places. Possibly could be done in a followup, or I can do it here if desired.
- more advanced potentially behavior-changing changes can be done in a followup, as this diff is big enough as it is, IMO. same with merging GCE Exprs into Unevaluated.
  - (... but if this takes a while to get reviewed, I might plop some more stuff into this PR)
- I think it would be cute to rename UnevaluatedConst to AliasConst or something, to better reflect the parallels to AliasTy, but shrug, haha

r? @BoxyUwU
tree: 1d38e9654e500a61884e80ae93b4c68dd41fa482
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. bootstrap.example.toml
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. license-metadata.json
  25. LICENSE-MIT
  26. package.json
  27. README.md
  28. RELEASES.md
  29. REUSE.toml
  30. rust-bors.toml
  31. rustfmt.toml
  32. triagebot.toml
  33. typos.toml
  34. x
  35. x.ps1
  36. x.py
  37. yarn.lock
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