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do a bunch of stuff to const generic feature gates #88324

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@BoxyUwU BoxyUwU commented Aug 25, 2021

  • rename const_evaluatable_checked to generic_const_exprs
  • remove lazy_normalization_consts
  • TODO rename const_generics to more_const_param_types/const_param_types and remove other stuff from the feature

r? @lcnr

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Some changes occurred in src/tools/clippy.

cc @rust-lang/clippy

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Aug 25, 2021
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@BoxyUwU BoxyUwU closed this Aug 26, 2021
bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 30, 2021
update const generics feature gates

**tl;dr: split const generics into three features: `adt_const_params`, `const_generics_defaults` and `generic_const_exprs`**

continuing the work of `@BoxyUwU` in rust-lang#88324, this PR
- renames `feature(const_evaluatable_checked)` to `feature(generic_const_exprs)` which now doesn't need any other feature gate to work. Previously `feature(const_evaluatable_checked)` was only useful in combination with `feature(const_generics)`.
- completely removes `feature(lazy_normalization_consts)`. This feature only supplied the parents generics to anonymous constants, which is pretty useless as generic anon consts are only allowed with `feature(generic_const_exprs)` anyways.
- moves the ability to use additional const param types from `feature(const_generics)` into `feature(adt_const_params)`. As `feature(const_generics)` is now mostly useless without `feature(generic_const_exprs)` we also remove that feature flag.
- updates tests, removing duplicates and unnecessary revisions in some cases and also deletes all unused `*.stderr` files.

I not also remove the ordering restriction for const and type parameters if any of the three const generics features is active.
This ordering restriction feels like the only "real" use of the current `feature(const_generics)` right now so this change isn't a perfect solution, but as I intend to stabilize the ordering - and `feature(const_generics_defaults)` -  in the very near future, I think this is acceptable for now.

---

cc `@rust-lang/project-const-generics` about the new feature names and this change in general.

I don't think we need any external approval for this change but I do intend to publish an update to the const generics tracking issue the day this PR lands, so I don't want this merged yet.

Apologies to whoever ends up reviewing this PR 😅 ❤️

r? rust-lang/project-const-generics
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