Use special DefIds for aliases

compiler/rustc_middle/src/ty/context/impl_interner.rs

@@ -8,7 +8,7 @@ use rustc_hir::def::{CtorKind, CtorOf, DefKind};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::lang_items::LangItem;
 use rustc_span::{DUMMY_SP, Span, Symbol};
-use rustc_type_ir::lang_items::{SolverAdtLangItem, SolverLangItem, SolverTraitLangItem};
+use rustc_type_ir::lang_items::{SolverAdtLangItem, SolverProjectionLangItem, SolverTraitLangItem};
 use rustc_type_ir::{CollectAndApply, Interner, TypeFoldable, Unnormalized, search_graph};
 
 use crate::dep_graph::{DepKind, DepNodeIndex};
@@ -39,6 +39,17 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type AdtId = DefId;
     type ImplId = DefId;
     type UnevaluatedConstId = DefId;
+    type DefinitionAssocTyId = DefId;
+    type DefinitionAssocConstId = DefId;
+    type DefinitionAssocTermId = DefId;
+    type OpaqueTyId = DefId;
+    type LocalOpaqueTyId = LocalDefId;
+    type FreeTyAliasId = DefId;
+    type FreeConstAliasId = DefId;
+    type FreeTermAliasId = DefId;
+    type ImplOrTraitAssocTyId = DefId;
+    type ImplOrTraitAssocConstId = DefId;
+    type ImplOrTraitAssocTermId = DefId;
     type Span = Span;
 
     type GenericArgs = ty::GenericArgsRef<'tcx>;
@@ -285,7 +296,11 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         self.mk_type_list_from_iter(args)
     }
 
-    fn parent(self, def_id: DefId) -> DefId {
+    fn projection_parent(self, def_id: Self::DefinitionAssocTermId) -> Self::TraitId {
+        self.parent(def_id)
+    }
+
+    fn impl_or_trait_assoc_term_parent(self, def_id: Self::ImplOrTraitAssocTyId) -> Self::ImplId {
         self.parent(def_id)
     }
 
@@ -443,7 +458,7 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         !self.codegen_fn_attrs(def_id).target_features.is_empty()
     }
 
-    fn require_lang_item(self, lang_item: SolverLangItem) -> DefId {
+    fn require_projection_lang_item(self, lang_item: SolverProjectionLangItem) -> DefId {
         self.require_lang_item(solver_lang_item_to_lang_item(lang_item), DUMMY_SP)
     }
 
@@ -455,7 +470,7 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         self.require_lang_item(solver_adt_lang_item_to_lang_item(lang_item), DUMMY_SP)
     }
 
-    fn is_lang_item(self, def_id: DefId, lang_item: SolverLangItem) -> bool {
+    fn is_projection_lang_item(self, def_id: DefId, lang_item: SolverProjectionLangItem) -> bool {
         self.is_lang_item(def_id, solver_lang_item_to_lang_item(lang_item))
     }
 
@@ -475,7 +490,7 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         self.is_sizedness_trait(def_id)
     }
 
-    fn as_lang_item(self, def_id: DefId) -> Option<SolverLangItem> {
+    fn as_projection_lang_item(self, def_id: DefId) -> Option<SolverProjectionLangItem> {
         lang_item_to_solver_lang_item(self.lang_items().from_def_id(def_id)?)
     }
 
@@ -754,7 +769,7 @@ macro_rules! bidirectional_lang_item_map {
 }
 
 bidirectional_lang_item_map! {
-    SolverLangItem, fn lang_item_to_solver_lang_item, fn solver_lang_item_to_lang_item;
+    SolverProjectionLangItem, fn lang_item_to_solver_lang_item, fn solver_lang_item_to_lang_item;
 
 // tidy-alphabetical-start
     AsyncFnKindUpvars,
@@ -788,7 +803,6 @@ bidirectional_lang_item_map! {
     AsyncFnKindHelper,
     AsyncFnMut,
     AsyncFnOnce,
-    AsyncFnOnceOutput,
     AsyncIterator,
     BikeshedGuaranteedNoDrop,
     Clone,

compiler/rustc_next_trait_solver/src/delegate.rs

@@ -67,7 +67,7 @@ pub trait SolverDelegate: Deref<Target = Self::Infcx> + Sized {
 
     fn add_item_bounds_for_hidden_type(
         &self,
-        def_id: <Self::Interner as Interner>::DefId,
+        def_id: <Self::Interner as Interner>::OpaqueTyId,
         args: <Self::Interner as Interner>::GenericArgs,
         param_env: <Self::Interner as Interner>::ParamEnv,
         hidden_ty: <Self::Interner as Interner>::Ty,
@@ -77,10 +77,10 @@ pub trait SolverDelegate: Deref<Target = Self::Infcx> + Sized {
     fn fetch_eligible_assoc_item(
         &self,
         goal_trait_ref: ty::TraitRef<Self::Interner>,
-        trait_assoc_def_id: <Self::Interner as Interner>::DefId,
+        trait_assoc_def_id: <Self::Interner as Interner>::DefinitionAssocTermId,
         impl_def_id: <Self::Interner as Interner>::ImplId,
     ) -> Result<
-        Option<<Self::Interner as Interner>::DefId>,
+        Option<<Self::Interner as Interner>::ImplOrTraitAssocTermId>,
         <Self::Interner as Interner>::ErrorGuaranteed,
     >;
 

compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs

@@ -4,7 +4,7 @@
 use derive_where::derive_where;
 use rustc_type_ir::data_structures::HashMap;
 use rustc_type_ir::inherent::*;
-use rustc_type_ir::lang_items::{SolverLangItem, SolverTraitLangItem};
+use rustc_type_ir::lang_items::{SolverProjectionLangItem, SolverTraitLangItem};
 use rustc_type_ir::solve::SizedTraitKind;
 use rustc_type_ir::solve::inspect::ProbeKind;
 use rustc_type_ir::{
@@ -106,7 +106,9 @@ where
             // We can resolve the `impl Trait` to its concrete type,
             // which enforces a DAG between the functions requiring
             // the auto trait bounds in question.
-            Ok(ty::Binder::dummy(vec![cx.type_of(def_id).instantiate(cx, args).skip_norm_wip()]))
+            Ok(ty::Binder::dummy(vec![
+                cx.type_of(def_id.into()).instantiate(cx, args).skip_norm_wip(),
+            ]))
         }
     }
 }
@@ -541,7 +543,8 @@ pub(in crate::solve) fn extract_tupled_inputs_and_output_from_async_callable<I:
                 );
             }
 
-            let future_output_def_id = cx.require_lang_item(SolverLangItem::FutureOutput);
+            let future_output_def_id =
+                cx.require_projection_lang_item(SolverProjectionLangItem::FutureOutput);
             let future_output_ty = Ty::new_projection(cx, future_output_def_id, [sig.output()]);
             Ok((
                 bound_sig.rebind(AsyncCallableRelevantTypes {
@@ -596,7 +599,8 @@ fn fn_item_to_async_callable<I: Interner>(
     let nested = vec![
         bound_sig.rebind(ty::TraitRef::new(cx, future_trait_def_id, [sig.output()])).upcast(cx),
     ];
-    let future_output_def_id = cx.require_lang_item(SolverLangItem::FutureOutput);
+    let future_output_def_id =
+        cx.require_projection_lang_item(SolverProjectionLangItem::FutureOutput);
     let future_output_ty = Ty::new_projection(cx, future_output_def_id, [sig.output()]);
     Ok((
         bound_sig.rebind(AsyncCallableRelevantTypes {
@@ -642,7 +646,8 @@ fn coroutine_closure_to_ambiguous_coroutine<I: Interner>(
     args: ty::CoroutineClosureArgs<I>,
     sig: ty::CoroutineClosureSignature<I>,
 ) -> I::Ty {
-    let upvars_projection_def_id = cx.require_lang_item(SolverLangItem::AsyncFnKindUpvars);
+    let upvars_projection_def_id =
+        cx.require_projection_lang_item(SolverProjectionLangItem::AsyncFnKindUpvars);
     let tupled_upvars_ty = Ty::new_projection(
         cx,
         upvars_projection_def_id,
@@ -920,7 +925,10 @@ where
             // show up in the bounds, but just ones that come from substituting
             // `Self` with the dyn type.
             let proj = proj.with_self_ty(cx, trait_ref.self_ty());
-            replace_projection_with.entry(proj.def_id()).or_default().push(bound.rebind(proj));
+            replace_projection_with
+                .entry(proj.def_id().into())
+                .or_default()
+                .push(bound.rebind(proj));
         }
     }
 

compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs

@@ -1152,9 +1152,9 @@ where
     pub(super) fn fetch_eligible_assoc_item(
         &self,
         goal_trait_ref: ty::TraitRef<I>,
-        trait_assoc_def_id: I::DefId,
+        trait_assoc_def_id: I::DefinitionAssocTermId,
         impl_def_id: I::ImplId,
-    ) -> Result<Option<I::DefId>, I::ErrorGuaranteed> {
+    ) -> Result<Option<I::ImplOrTraitAssocTermId>, I::ErrorGuaranteed> {
         self.delegate.fetch_eligible_assoc_item(goal_trait_ref, trait_assoc_def_id, impl_def_id)
     }
 
@@ -1169,7 +1169,7 @@ where
 
     pub(super) fn add_item_bounds_for_hidden_type(
         &mut self,
-        opaque_def_id: I::DefId,
+        opaque_def_id: I::OpaqueTyId,
         opaque_args: I::GenericArgs,
         param_env: I::ParamEnv,
         hidden_ty: I::Ty,

compiler/rustc_next_trait_solver/src/solve/mod.rs

@@ -357,7 +357,7 @@ where
         }
     }
 
-    fn opaque_type_is_rigid(&self, def_id: I::DefId) -> bool {
+    fn opaque_type_is_rigid(&self, def_id: I::OpaqueTyId) -> bool {
         match self.typing_mode() {
             // Opaques are never rigid outside of analysis mode.
             TypingMode::Coherence | TypingMode::PostAnalysis => false,
@@ -366,7 +366,7 @@ where
             TypingMode::Analysis { defining_opaque_types_and_generators: non_rigid_opaques }
             | TypingMode::Borrowck { defining_opaque_types: non_rigid_opaques }
             | TypingMode::PostBorrowckAnalysis { defined_opaque_types: non_rigid_opaques } => {
-                !def_id.as_local().is_some_and(|def_id| non_rigid_opaques.contains(&def_id))
+                !def_id.as_local().is_some_and(|def_id| non_rigid_opaques.contains(&def_id.into()))
             }
         }
     }

compiler/rustc_next_trait_solver/src/solve/normalizes_to/anon_const.rs

@@ -13,13 +13,11 @@ where
     pub(super) fn normalize_anon_const(
         &mut self,
         goal: Goal<I, ty::NormalizesTo<I>>,
+        def_id: I::UnevaluatedConstId,
     ) -> QueryResult<I> {
         if let Some(normalized_const) = self.evaluate_const(
             goal.param_env,
-            ty::UnevaluatedConst::new(
-                goal.predicate.alias.def_id().try_into().unwrap(),
-                goal.predicate.alias.args,
-            ),
+            ty::UnevaluatedConst::new(def_id, goal.predicate.alias.args),
         ) {
             self.instantiate_normalizes_to_term(goal, normalized_const.into());
             self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)

compiler/rustc_next_trait_solver/src/solve/normalizes_to/inherent.rs

@@ -18,11 +18,12 @@ where
     pub(super) fn normalize_inherent_associated_term(
         &mut self,
         goal: Goal<I, ty::NormalizesTo<I>>,
+        def_id: I::ImplOrTraitAssocTermId,
     ) -> QueryResult<I> {
         let cx = self.cx();
         let inherent = goal.predicate.alias;
 
-        let impl_def_id = cx.parent(inherent.def_id());
+        let impl_def_id = cx.impl_or_trait_assoc_term_parent(def_id);
         let impl_args = self.fresh_args_for_item(impl_def_id);
 
         // Equate impl header and add impl where clauses
@@ -46,19 +47,16 @@ where
         // to be very careful when changing the impl where-clauses to be productive.
         self.add_goals(
             GoalSource::Misc,
-            cx.predicates_of(inherent.def_id())
+            cx.predicates_of(def_id.into())
                 .iter_instantiated(cx, inherent_args)
                 .map(Unnormalized::skip_norm_wip)
                 .map(|pred| goal.with(cx, pred)),
         );
 
         let normalized = if inherent.kind(cx).is_type() {
-            cx.type_of(inherent.def_id()).instantiate(cx, inherent_args).skip_norm_wip().into()
+            cx.type_of(def_id.into()).instantiate(cx, inherent_args).skip_norm_wip().into()
         } else {
-            cx.const_of_item(inherent.def_id())
-                .instantiate(cx, inherent_args)
-                .skip_norm_wip()
-                .into()
+            cx.const_of_item(def_id.into()).instantiate(cx, inherent_args).skip_norm_wip().into()
         };
         self.instantiate_normalizes_to_term(goal, normalized);
         self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)