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Rollup merge of #137043 - Sky9x:unsafe-pinned-pt1-libs, r=tgross35,RalfJung,WaffleLapkin

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Initial `UnsafePinned` implementation [Part 1: Libs]

Initial libs changes necessary to unblock further work on [RFC 3467](https://rust-lang.github.io/rfcs/3467-unsafe-pinned.html).
Tracking issue: #125735

This PR is split off from #136964, and includes just the libs changes:
- `UnsafePinned` struct
- private `UnsafeUnpin` structural auto trait
- Lang items for both
- Compiler changes necessary to block niches on `UnsafePinned`

This PR does not change codegen, miri, the existing `!Unpin` hack, or anything else. That work is to be split into later PRs.

---

cc ``@RalfJung`` ``@Noratrieb``

``@rustbot`` label F-unsafe_pinned T-libs-api
This commit is contained in:
Jacob Pratt 2025-04-13 17:37:51 -04:00 • committed by GitHub
commit d04df1cba9
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11 changed files with 290 additions and 8 deletions
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3
compiler/rustc_hir/src/lang_items.rs
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@ -182,6 +182,7 @@ language_item_table! {
DynMetadata, sym::dyn_metadata, dyn_metadata, Target::Struct, GenericRequirement::None;
Freeze, sym::freeze, freeze_trait, Target::Trait, GenericRequirement::Exact(0);
UnsafeUnpin, sym::unsafe_unpin, unsafe_unpin_trait, Target::Trait, GenericRequirement::Exact(0);
FnPtrTrait, sym::fn_ptr_trait, fn_ptr_trait, Target::Trait, GenericRequirement::Exact(0);
FnPtrAddr, sym::fn_ptr_addr, fn_ptr_addr, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
@ -235,6 +236,8 @@ language_item_table! {
IndexMut, sym::index_mut, index_mut_trait, Target::Trait, GenericRequirement::Exact(1);
UnsafeCell, sym::unsafe_cell, unsafe_cell_type, Target::Struct, GenericRequirement::None;
UnsafePinned, sym::unsafe_pinned, unsafe_pinned_type, Target::Struct, GenericRequirement::None;
VaList, sym::va_list, va_list, Target::Struct, GenericRequirement::None;
Deref, sym::deref, deref_trait, Target::Trait, GenericRequirement::Exact(0);