Make Clone::clone a lang item

rust-lang · Jul 25, 2024 · 500db24 · 500db24
1 parent 92c6c03
commit 500db24
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Showing 4 changed files with 4 additions and 2 deletions.
diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
@@ -413,6 +413,7 @@ language_item_table! {
  EffectsIntersectionOutput, sym::EffectsIntersectionOutput, effects_intersection_output, Target::AssocTy, GenericRequirement::None;
  EffectsCompat, sym::EffectsCompat, effects_compat, Target::Trait, GenericRequirement::Exact(1);
  EffectsTyCompat, sym::EffectsTyCompat, effects_ty_compat, Target::Trait, GenericRequirement::Exact(1);
+ CloneFn, sym::clone_fn, clone_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
 }
 
 pub enum GenericRequirement {

diff --git a/compiler/rustc_mir_transform/src/instsimplify.rs b/compiler/rustc_mir_transform/src/instsimplify.rs
@@ -271,8 +271,7 @@ impl<'tcx> InstSimplifyContext<'tcx, '_> {
  return;
  }
 
- let trait_def_id = self.tcx.trait_of_item(fn_def_id);
- if trait_def_id.is_none() || trait_def_id != self.tcx.lang_items().clone_trait() {
+ if Some(fn_def_id) != self.tcx.lang_items().clone_fn() {
  return;
  }
 

diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
@@ -557,6 +557,7 @@ symbols! {
  clobber_abi,
  clone,
  clone_closures,
+ clone_fn,
  clone_from,
  closure,
  closure_lifetime_binder,

diff --git a/library/core/src/clone.rs b/library/core/src/clone.rs
@@ -160,6 +160,7 @@ pub trait Clone: Sized {
  /// ```
  #[stable(feature = "rust1", since = "1.0.0")]
  #[must_use = "cloning is often expensive and is not expected to have side effects"]
+ #[cfg_attr(not(bootstrap), lang = "clone_fn")]
  fn clone(&self) -> Self;
 
  /// Performs copy-assignment from `source`.