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Arbitrary self types v2: (unused) Receiver trait

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This commit contains a new Receiver trait, which is the basis for the
Arbitrary Self Types v2 RFC. This allows smart pointers to be method
receivers even if they're not Deref.

This is currently unused by the compiler - a subsequent PR will start to
use this for method resolution if the arbitrary_self_types feature gate
is enabled. This is being landed first simply to make review
simpler: if people feel this should all be in an atomic PR let me know.

This is a part of the arbitrary self types v2 project,
https://github.com/rust-lang/rfcs/pull/3519
https://github.com/rust-lang/rust/issues/44874

r? @wesleywiser
This commit is contained in:
Adrian Taylor 2024-10-25 11:07:06 +00:00
parent f61306d47b
commit ecfcd0879c
4 changed files with 93 additions and 2 deletions
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2
compiler/rustc_hir/src/lang_items.rs
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@ -241,6 +241,8 @@ language_item_table! {
DerefMut, sym::deref_mut, deref_mut_trait, Target::Trait, GenericRequirement::Exact(0);
DerefPure, sym::deref_pure, deref_pure_trait, Target::Trait, GenericRequirement::Exact(0);
DerefTarget, sym::deref_target, deref_target, Target::AssocTy, GenericRequirement::None;
Receiver, sym::receiver, receiver_trait, Target::Trait, GenericRequirement::None;
ReceiverTarget, sym::receiver_target, receiver_target, Target::AssocTy, GenericRequirement::None;
LegacyReceiver, sym::legacy_receiver, legacy_receiver_trait, Target::Trait, GenericRequirement::None;
Fn, kw::Fn, fn_trait, Target::Trait, GenericRequirement::Exact(1);