Uplift elaboration

5 files changed, 118 insertions, 6 deletions

diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index dca48069974..59ab5d79139 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -347,12 +347,16 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     fn explicit_super_predicates_of(
         self,
         def_id: DefId,
-    ) -> ty::EarlyBinder<'tcx, impl IntoIterator<Item = ty::Clause<'tcx>>> {
+    ) -> ty::EarlyBinder<'tcx, impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>> {
+        ty::EarlyBinder::bind(self.explicit_super_predicates_of(def_id).instantiate_identity(self))
+    }
+
+    fn explicit_implied_predicates_of(
+        self,
+        def_id: DefId,
+    ) -> ty::EarlyBinder<'tcx, impl IntoIterator<Item = (ty::Clause<'tcx>, Span)>> {
         ty::EarlyBinder::bind(
-            self.explicit_super_predicates_of(def_id)
-                .instantiate_identity(self)
-                .predicates
-                .into_iter(),
+            self.explicit_implied_predicates_of(def_id).instantiate_identity(self),
         )
     }
 
@@ -569,6 +573,13 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     ) -> Ty<'tcx> {
         placeholder.find_const_ty_from_env(param_env)
     }
+
+    fn anonymize_bound_vars<T: TypeFoldable<TyCtxt<'tcx>>>(
+        self,
+        binder: ty::Binder<'tcx, T>,
+    ) -> ty::Binder<'tcx, T> {
+        self.anonymize_bound_vars(binder)
+    }
 }
 
 macro_rules! bidirectional_lang_item_map {
diff --git a/compiler/rustc_middle/src/ty/elaborate_impl.rs b/compiler/rustc_middle/src/ty/elaborate_impl.rs
new file mode 100644
index 00000000000..8c89a2d884b
--- /dev/null
+++ b/compiler/rustc_middle/src/ty/elaborate_impl.rs
@@ -0,0 +1,84 @@
+use rustc_span::Span;
+use rustc_type_ir::elaborate::Elaboratable;
+
+use crate::ty::{self, TyCtxt};
+
+impl<'tcx> Elaboratable<TyCtxt<'tcx>> for ty::Clause<'tcx> {
+    fn predicate(&self) -> ty::Predicate<'tcx> {
+        self.as_predicate()
+    }
+
+    fn child(&self, clause: ty::Clause<'tcx>) -> Self {
+        clause
+    }
+
+    fn child_with_derived_cause(
+        &self,
+        clause: ty::Clause<'tcx>,
+        _span: Span,
+        _parent_trait_pred: ty::PolyTraitPredicate<'tcx>,
+        _index: usize,
+    ) -> Self {
+        clause
+    }
+}
+
+impl<'tcx> Elaboratable<TyCtxt<'tcx>> for ty::Predicate<'tcx> {
+    fn predicate(&self) -> ty::Predicate<'tcx> {
+        *self
+    }
+
+    fn child(&self, clause: ty::Clause<'tcx>) -> Self {
+        clause.as_predicate()
+    }
+
+    fn child_with_derived_cause(
+        &self,
+        clause: ty::Clause<'tcx>,
+        _span: Span,
+        _parent_trait_pred: ty::PolyTraitPredicate<'tcx>,
+        _index: usize,
+    ) -> Self {
+        clause.as_predicate()
+    }
+}
+
+impl<'tcx> Elaboratable<TyCtxt<'tcx>> for (ty::Predicate<'tcx>, Span) {
+    fn predicate(&self) -> ty::Predicate<'tcx> {
+        self.0
+    }
+
+    fn child(&self, clause: ty::Clause<'tcx>) -> Self {
+        (clause.as_predicate(), self.1)
+    }
+
+    fn child_with_derived_cause(
+        &self,
+        clause: ty::Clause<'tcx>,
+        _span: Span,
+        _parent_trait_pred: ty::PolyTraitPredicate<'tcx>,
+        _index: usize,
+    ) -> Self {
+        (clause.as_predicate(), self.1)
+    }
+}
+
+impl<'tcx> Elaboratable<TyCtxt<'tcx>> for (ty::Clause<'tcx>, Span) {
+    fn predicate(&self) -> ty::Predicate<'tcx> {
+        self.0.as_predicate()
+    }
+
+    fn child(&self, clause: ty::Clause<'tcx>) -> Self {
+        (clause, self.1)
+    }
+
+    fn child_with_derived_cause(
+        &self,
+        clause: ty::Clause<'tcx>,
+        _span: Span,
+        _parent_trait_pred: ty::PolyTraitPredicate<'tcx>,
+        _index: usize,
+    ) -> Self {
+        (clause, self.1)
+    }
+}
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 7d57d88f40f..4470db47474 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -148,6 +148,7 @@ mod closure;
 mod consts;
 mod context;
 mod diagnostics;
+mod elaborate_impl;
 mod erase_regions;
 mod generic_args;
 mod generics;
diff --git a/compiler/rustc_middle/src/ty/predicate.rs b/compiler/rustc_middle/src/ty/predicate.rs
index e9b37503bb3..c2cc3be3aaa 100644
--- a/compiler/rustc_middle/src/ty/predicate.rs
+++ b/compiler/rustc_middle/src/ty/predicate.rs
@@ -46,6 +46,10 @@ pub struct Predicate<'tcx>(
 );
 
 impl<'tcx> rustc_type_ir::inherent::Predicate<TyCtxt<'tcx>> for Predicate<'tcx> {
+    fn as_clause(self) -> Option<ty::Clause<'tcx>> {
+        self.as_clause()
+    }
+
     fn is_coinductive(self, interner: TyCtxt<'tcx>) -> bool {
         self.is_coinductive(interner)
     }
@@ -173,7 +177,11 @@ pub struct Clause<'tcx>(
     pub(super) Interned<'tcx, WithCachedTypeInfo<ty::Binder<'tcx, PredicateKind<'tcx>>>>,
 );
 
-impl<'tcx> rustc_type_ir::inherent::Clause<TyCtxt<'tcx>> for Clause<'tcx> {}
+impl<'tcx> rustc_type_ir::inherent::Clause<TyCtxt<'tcx>> for Clause<'tcx> {
+    fn instantiate_supertrait(self, tcx: TyCtxt<'tcx>, trait_ref: ty::PolyTraitRef<'tcx>) -> Self {
+        self.instantiate_supertrait(tcx, trait_ref)
+    }
+}
 
 impl<'tcx> rustc_type_ir::inherent::IntoKind for Clause<'tcx> {
     type Kind = ty::Binder<'tcx, ClauseKind<'tcx>>;
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 52690ae678d..d2b444a066b 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -811,6 +811,14 @@ impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
         Ty::new_var(tcx, vid)
     }
 
+    fn new_param(tcx: TyCtxt<'tcx>, param: ty::ParamTy) -> Self {
+        Ty::new_param(tcx, param.index, param.name)
+    }
+
+    fn new_placeholder(tcx: TyCtxt<'tcx>, placeholder: ty::PlaceholderType) -> Self {
+        Ty::new_placeholder(tcx, placeholder)
+    }
+
     fn new_bound(interner: TyCtxt<'tcx>, debruijn: ty::DebruijnIndex, var: ty::BoundTy) -> Self {
         Ty::new_bound(interner, debruijn, var)
     }