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Auto merge of #120639 - fee1-dead-contrib:new-effects-desugaring, r=oli-obk

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Implement new effects desugaring

cc `@rust-lang/project-const-traits.` Will write down notes once I have finished.

* [x] See if we want `T: Tr` to desugar into `T: Tr, T::Effects: Compat<true>`
* [x] Fix ICEs on `type Assoc: ~const Tr` and `type Assoc<T: ~const Tr>`
* [ ] add types and traits to minicore test
* [ ] update rustc-dev-guide

Fixes #119717
Fixes #123664
Fixes #124857
Fixes #126148
This commit is contained in:
bors 2024-06-29 20:08:10 +00:00
commit ba1d7f4a08
175 changed files with 2234 additions and 1576 deletions
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5
compiler/rustc_const_eval/src/const_eval/fn_queries.rs
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@ -42,10 +42,7 @@ fn constness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Constness {
| hir::Node::ImplItem(hir::ImplItem { kind: hir::ImplItemKind::Const(..), .. }) => {
hir::Constness::Const
}
hir::Node::Item(hir::Item { kind: hir::ItemKind::Impl(_), .. }) => tcx
.generics_of(def_id)
.host_effect_index
.map_or(hir::Constness::NotConst, |_| hir::Constness::Const),
hir::Node::Item(hir::Item { kind: hir::ItemKind::Impl(impl_), .. }) => impl_.constness,
hir::Node::ForeignItem(hir::ForeignItem { kind: hir::ForeignItemKind::Fn(..), .. }) => {
// Intrinsics use `rustc_const_{un,}stable` attributes to indicate constness. All other
// foreign items cannot be evaluated at compile-time.