add EarlyBinder to output of explicit_item_bounds; replace bound_explicit_item_bounds usages; remove bound_explicit_item_bounds query

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -706,7 +706,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 .copied()
                 .find_map(find_fn_kind_from_did),
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => tcx
-                .bound_explicit_item_bounds(def_id)
+                .explicit_item_bounds(def_id)
                 .subst_iter_copied(tcx, substs)
                 .find_map(find_fn_kind_from_did),
             ty::Closure(_, substs) => match substs.as_closure().kind() {

compiler/rustc_hir_analysis/src/check/check.rs

@@ -318,10 +318,8 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
             tcx,
             selftys: vec![],
         };
-        let prohibit_opaque = tcx
+        let prohibit_opaque =
-            .bound_explicit_item_bounds(def_id.to_def_id())
+            tcx.explicit_item_bounds(def_id).transpose_iter().try_for_each(|bound| {
-            .transpose_iter()
-            .try_for_each(|bound| {
                 let predicate = bound.map_bound(|&(predicate, _)| predicate).subst_identity();
                 predicate.visit_with(&mut visitor)
             });

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -839,7 +839,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'_, 'tcx> {
             });
             self.types.insert(proj.def_id, (infer_ty, proj.substs));
             // Recurse into bounds
-            for (pred, pred_span) in self.interner().bound_explicit_item_bounds(proj.def_id).subst_iter_copied(self.interner(), proj.substs) {
+            for (pred, pred_span) in self.interner().explicit_item_bounds(proj.def_id).subst_iter_copied(self.interner(), proj.substs) {
                 let pred = pred.fold_with(self);
                 let pred = self.ocx.normalize(
                     &ObligationCause::misc(self.span, self.body_id),
@@ -2023,7 +2023,7 @@ pub(super) fn check_type_bounds<'tcx>(
     };
 
     let obligations: Vec<_> = tcx
-        .bound_explicit_item_bounds(trait_ty.def_id)
+        .explicit_item_bounds(trait_ty.def_id)
         .subst_iter_copied(tcx, rebased_substs)
         .map(|(concrete_ty_bound, span)| {
             debug!("check_type_bounds: concrete_ty_bound = {:?}", concrete_ty_bound);

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -360,7 +360,7 @@ fn check_gat_where_clauses(tcx: TyCtxt<'_>, associated_items: &[hir::TraitItemRe
                             tcx,
                             param_env,
                             item_def_id,
-                            tcx.bound_explicit_item_bounds(item_def_id.to_def_id())
+                            tcx.explicit_item_bounds(item_def_id)
                                 .transpose_iter()
                                 .map(|bound| bound.map_bound(|b| *b).subst_identity())
                                 .collect::<Vec<_>>(),
@@ -1125,7 +1125,7 @@ fn check_trait(tcx: TyCtxt<'_>, item: &hir::Item<'_>) {
 /// Assuming the defaults are used, check that all predicates (bounds on the
 /// assoc type and where clauses on the trait) hold.
 fn check_associated_type_bounds(wfcx: &WfCheckingCtxt<'_, '_>, item: ty::AssocItem, span: Span) {
-    let bounds = wfcx.tcx().bound_explicit_item_bounds(item.def_id);
+    let bounds = wfcx.tcx().explicit_item_bounds(item.def_id);
 
     debug!("check_associated_type_bounds: bounds={:?}", bounds);
     let wf_obligations = bounds.transpose_iter().flat_map(|b| {
@@ -1592,7 +1592,7 @@ impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ImplTraitInTraitFinder<'_, 'tcx> {
                 }
             });
             for (bound, bound_span) in tcx
-                .bound_explicit_item_bounds(opaque_ty.def_id)
+                .explicit_item_bounds(opaque_ty.def_id)
                 .subst_iter_copied(tcx, opaque_ty.substs)
             {
                 let bound = self.wfcx.normalize(bound_span, None, bound);

compiler/rustc_hir_analysis/src/collect/item_bounds.rs

@@ -79,14 +79,14 @@ fn opaque_type_bounds<'tcx>(
 pub(super) fn explicit_item_bounds(
     tcx: TyCtxt<'_>,
     def_id: LocalDefId,
-) -> &'_ [(ty::Predicate<'_>, Span)] {
+) -> ty::EarlyBinder<&'_ [(ty::Predicate<'_>, Span)]> {
     match tcx.opt_rpitit_info(def_id.to_def_id()) {
         // RPITIT's bounds are the same as opaque type bounds, but with
         // a projection self type.
         Some(ty::ImplTraitInTraitData::Trait { opaque_def_id, .. }) => {
             let item = tcx.hir().get_by_def_id(opaque_def_id.expect_local()).expect_item();
             let opaque_ty = item.expect_opaque_ty();
-            return opaque_type_bounds(
+            return ty::EarlyBinder(opaque_type_bounds(
                 tcx,
                 opaque_def_id.expect_local(),
                 opaque_ty.bounds,
@@ -95,7 +95,7 @@ pub(super) fn explicit_item_bounds(
                     ty::InternalSubsts::identity_for_item(tcx, def_id),
                 ),
                 item.span,
-            );
+            ));
         }
         // These should have been fed!
         Some(ty::ImplTraitInTraitData::Impl { .. }) => unreachable!(),
@@ -103,7 +103,7 @@ pub(super) fn explicit_item_bounds(
     }
 
     let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
-    match tcx.hir().get(hir_id) {
+    let bounds = match tcx.hir().get(hir_id) {
         hir::Node::TraitItem(hir::TraitItem {
             kind: hir::TraitItemKind::Type(bounds, _),
             span,
@@ -123,14 +123,15 @@ pub(super) fn explicit_item_bounds(
             opaque_type_bounds(tcx, def_id, bounds, item_ty, *span)
         }
         _ => bug!("item_bounds called on {:?}", def_id),
-    }
+    };
+    ty::EarlyBinder(bounds)
 }
 
 pub(super) fn item_bounds(
     tcx: TyCtxt<'_>,
     def_id: DefId,
 ) -> ty::EarlyBinder<&'_ ty::List<ty::Predicate<'_>>> {
-    tcx.bound_explicit_item_bounds(def_id).map_bound(|bounds| {
+    tcx.explicit_item_bounds(def_id).map_bound(|bounds| {
         tcx.mk_predicates_from_iter(util::elaborate(
             tcx,
             bounds.iter().map(|&(bound, _span)| bound),

compiler/rustc_hir_analysis/src/variance/mod.rs

@@ -153,7 +153,7 @@ fn variance_of_opaque(tcx: TyCtxt<'_>, item_def_id: LocalDefId) -> &[ty::Varianc
     let mut collector =
         OpaqueTypeLifetimeCollector { tcx, root_def_id: item_def_id.to_def_id(), variances };
     let id_substs = ty::InternalSubsts::identity_for_item(tcx, item_def_id);
-    for pred in tcx.bound_explicit_item_bounds(item_def_id.to_def_id()).transpose_iter() {
+    for pred in tcx.explicit_item_bounds(item_def_id).transpose_iter() {
         let pred = pred.map_bound(|(pred, _)| *pred).subst(tcx, id_substs);
         debug!(?pred);
 

compiler/rustc_hir_typeck/src/_match.rs

@@ -530,7 +530,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 for ty in [first_ty, second_ty] {
                     for (pred, _) in self
                         .tcx
-                        .bound_explicit_item_bounds(rpit_def_id)
+                        .explicit_item_bounds(rpit_def_id)
                         .subst_iter_copied(self.tcx, substs)
                     {
                         let pred = pred.kind().rebind(match pred.kind().skip_binder() {

compiler/rustc_hir_typeck/src/closure.rs

@@ -172,7 +172,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => self
                 .deduce_closure_signature_from_predicates(
                     expected_ty,
-                    self.tcx.bound_explicit_item_bounds(def_id).subst_iter_copied(self.tcx, substs),
+                    self.tcx.explicit_item_bounds(def_id).subst_iter_copied(self.tcx, substs),
                 ),
             ty::Dynamic(ref object_type, ..) => {
                 let sig = object_type.projection_bounds().find_map(|pb| {
@@ -713,13 +713,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => self
                 .tcx
-                .bound_explicit_item_bounds(def_id)
+                .explicit_item_bounds(def_id)
                 .subst_iter_copied(self.tcx, substs)
                 .find_map(|(p, s)| get_future_output(p, s))?,
             ty::Error(_) => return None,
             ty::Alias(ty::Projection, proj) if self.tcx.is_impl_trait_in_trait(proj.def_id) => self
                 .tcx
-                .bound_explicit_item_bounds(proj.def_id)
+                .explicit_item_bounds(proj.def_id)
                 .subst_iter_copied(self.tcx, proj.substs)
                 .find_map(|(p, s)| get_future_output(p, s))?,
             _ => span_bug!(

compiler/rustc_hir_typeck/src/generator_interior/mod.rs

@@ -571,8 +571,8 @@ fn check_must_not_suspend_ty<'tcx>(
         // FIXME: support adding the attribute to TAITs
         ty::Alias(ty::Opaque, ty::AliasTy { def_id: def, .. }) => {
             let mut has_emitted = false;
-            for bound in fcx.tcx.bound_explicit_item_bounds(def).transpose_iter() {
+            for bound in fcx.tcx.explicit_item_bounds(def).transpose_iter() {
-                let predicate = bound.map_bound(|&(predicate, _)| predicate).subst_identity();
+                let predicate = bound.map_bound(|&(pred, _)| pred).subst_identity();
                 // We only look at the `DefId`, so it is safe to skip the binder here.
                 if let ty::PredicateKind::Clause(ty::Clause::Trait(ref poly_trait_predicate)) =
                     predicate.kind().skip_binder()

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -402,7 +402,7 @@ impl<'tcx> InferCtxt<'tcx> {
         let future_trait = self.tcx.require_lang_item(LangItem::Future, None);
         let item_def_id = self.tcx.associated_item_def_ids(future_trait)[0];
 
-        self.tcx.bound_explicit_item_bounds(def_id).subst_iter_copied(self.tcx, substs).find_map(
+        self.tcx.explicit_item_bounds(def_id).subst_iter_copied(self.tcx, substs).find_map(
             |(predicate, _)| {
                 predicate
                     .kind()

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -540,7 +540,7 @@ impl<'tcx> InferCtxt<'tcx> {
                 .obligations;
         }
 
-        let item_bounds = tcx.bound_explicit_item_bounds(def_id.to_def_id());
+        let item_bounds = tcx.explicit_item_bounds(def_id);
 
         for (predicate, _) in item_bounds.subst_iter_copied(tcx, substs) {
             let predicate = predicate.fold_with(&mut BottomUpFolder {

compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs

@@ -74,7 +74,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
         // For every projection predicate in the opaque type's explicit bounds,
         // check that the type that we're assigning actually satisfies the bounds
         // of the associated type.
-        for bound in cx.tcx.bound_explicit_item_bounds(def_id).transpose_iter() {
+        for bound in cx.tcx.explicit_item_bounds(def_id).transpose_iter() {
             let (pred, pred_span) = bound.map_bound(|b| *b).subst_identity();
 
             // Liberate bound regions in the predicate since we
@@ -114,7 +114,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
             // with `impl Send: OtherTrait`.
             for (assoc_pred, assoc_pred_span) in cx
                 .tcx
-                .bound_explicit_item_bounds(proj.projection_ty.def_id)
+                .explicit_item_bounds(proj.projection_ty.def_id)
                 .subst_iter_copied(cx.tcx, &proj.projection_ty.substs)
             {
                 let assoc_pred = assoc_pred.fold_with(proj_replacer);

compiler/rustc_lint/src/unused.rs

@@ -257,7 +257,7 @@ impl<'tcx> LateLintPass<'tcx> for UnusedResults {
                     elaborate(
                         cx.tcx,
                         cx.tcx
-                            .bound_explicit_item_bounds(def)
+                            .explicit_item_bounds(def)
                             .transpose_iter()
                             .map(|bound| bound.map_bound(|b| *b).subst_identity()),
                     )

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -203,7 +203,11 @@ impl IntoArgs for (CrateNum, SimplifiedType) {
 }
 
 provide! { tcx, def_id, other, cdata,
-    explicit_item_bounds => { table_defaulted_array }
+    explicit_item_bounds => {
+        let lazy = cdata.root.tables.explicit_item_bounds.get(cdata, def_id.index);
+        let output = if lazy.is_default() { &mut [] } else { tcx.arena.alloc_from_iter(lazy.decode((cdata, tcx))) };
+        ty::EarlyBinder(&*output)
+    }
     explicit_predicates_of => { table }
     generics_of => { table }
     inferred_outlives_of => { table_defaulted_array }

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1425,7 +1425,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
 
     fn encode_explicit_item_bounds(&mut self, def_id: DefId) {
         debug!("EncodeContext::encode_explicit_item_bounds({:?})", def_id);
-        let bounds = self.tcx.explicit_item_bounds(def_id);
+        let bounds = self.tcx.explicit_item_bounds(def_id).skip_binder();
         record_defaulted_array!(self.tables.explicit_item_bounds[def_id] <- bounds);
     }
 

compiler/rustc_middle/src/query/mod.rs

@@ -274,7 +274,7 @@ rustc_queries! {
     /// `key` is the `DefId` of the associated type or opaque type.
     ///
     /// Bounds from the parent (e.g. with nested impl trait) are not included.
-    query explicit_item_bounds(key: DefId) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
+    query explicit_item_bounds(key: DefId) -> ty::EarlyBinder<&'tcx [(ty::Predicate<'tcx>, Span)]> {
         desc { |tcx| "finding item bounds for `{}`", tcx.def_path_str(key) }
         cache_on_disk_if { key.is_local() }
         separate_provide_extern

compiler/rustc_middle/src/ty/context.rs

@@ -1611,7 +1611,7 @@ impl<'tcx> TyCtxt<'tcx> {
         let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = ty.kind() else { return false };
         let future_trait = self.require_lang_item(LangItem::Future, None);
 
-        self.bound_explicit_item_bounds(*def_id).skip_binder().iter().any(|(predicate, _)| {
+        self.explicit_item_bounds(def_id).skip_binder().iter().any(|(predicate, _)| {
             let ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) = predicate.kind().skip_binder() else {
                 return false;
             };

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -911,7 +911,7 @@ pub trait PrettyPrinter<'tcx>:
 
         // Grab the "TraitA + TraitB" from `impl TraitA + TraitB`,
         // by looking up the projections associated with the def_id.
-        let bounds = tcx.bound_explicit_item_bounds(def_id);
+        let bounds = tcx.explicit_item_bounds(def_id);
 
         let mut traits = FxIndexMap::default();
         let mut fn_traits = FxIndexMap::default();

compiler/rustc_middle/src/ty/util.rs

@@ -694,13 +694,6 @@ impl<'tcx> TyCtxt<'tcx> {
         if visitor.found_recursion { Err(expanded_type) } else { Ok(expanded_type) }
     }
 
-    pub fn bound_explicit_item_bounds(
-        self,
-        def_id: DefId,
-    ) -> ty::EarlyBinder<&'tcx [(ty::Predicate<'tcx>, rustc_span::Span)]> {
-        ty::EarlyBinder(self.explicit_item_bounds(def_id))
-    }
-
     /// Returns names of captured upvars for closures and generators.
     ///
     /// Here are some examples:

compiler/rustc_mir_transform/src/generator.rs

@@ -1800,7 +1800,7 @@ fn check_must_not_suspend_ty<'tcx>(
         // FIXME: support adding the attribute to TAITs
         ty::Alias(ty::Opaque, ty::AliasTy { def_id: def, .. }) => {
             let mut has_emitted = false;
-            for bound in tcx.bound_explicit_item_bounds(def).transpose_iter() {
+            for bound in tcx.explicit_item_bounds(def).transpose_iter() {
                 let predicate = bound.map_bound(|&(pred, _)| pred).subst_identity();
 
                 // We only look at the `DefId`, so it is safe to skip the binder here.

compiler/rustc_privacy/src/lib.rs

@@ -269,7 +269,7 @@ where
                     // and are visited by shallow visitors.
                     self.visit_predicates(ty::GenericPredicates {
                         parent: None,
-                        predicates: tcx.bound_explicit_item_bounds(def_id).skip_binder(),
+                        predicates: tcx.explicit_item_bounds(def_id).skip_binder(),
                     })?;
                 }
             }
@@ -1784,10 +1784,7 @@ impl SearchInterfaceForPrivateItemsVisitor<'_> {
     fn bounds(&mut self) -> &mut Self {
         self.visit_predicates(ty::GenericPredicates {
             parent: None,
-            predicates: self
+            predicates: self.tcx.explicit_item_bounds(self.item_def_id).skip_binder(),
-                .tcx
-                .bound_explicit_item_bounds(self.item_def_id.to_def_id())
-                .skip_binder(),
         });
         self
     }

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -297,7 +297,7 @@ fn bounds_reference_self(tcx: TyCtxt<'_>, trait_def_id: DefId) -> SmallVec<[Span
     tcx.associated_items(trait_def_id)
         .in_definition_order()
         .filter(|item| item.kind == ty::AssocKind::Type)
-        .flat_map(|item| tcx.bound_explicit_item_bounds(item.def_id).transpose_iter())
+        .flat_map(|item| tcx.explicit_item_bounds(item.def_id).transpose_iter())
         .map(|bound| bound.map_bound(|b| *b).subst_identity())
         .filter_map(|pred_span| predicate_references_self(tcx, pred_span))
         .collect()

compiler/rustc_traits/src/chalk/db.rs

@@ -50,7 +50,7 @@ impl<'tcx> RustIrDatabase<'tcx> {
     where
         ty::Predicate<'tcx>: LowerInto<'tcx, std::option::Option<T>>,
     {
-        let bounds = self.interner.tcx.bound_explicit_item_bounds(def_id);
+        let bounds = self.interner.tcx.explicit_item_bounds(def_id);
         bounds
             .0
             .iter()
@@ -506,7 +506,7 @@ impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'t
 
         let identity_substs = InternalSubsts::identity_for_item(self.interner.tcx, opaque_ty_id.0);
 
-        let explicit_item_bounds = self.interner.tcx.bound_explicit_item_bounds(opaque_ty_id.0);
+        let explicit_item_bounds = self.interner.tcx.explicit_item_bounds(opaque_ty_id.0);
         let bounds =
             explicit_item_bounds
                 .0

src/librustdoc/clean/mod.rs

@@ -421,7 +421,7 @@ fn clean_projection<'tcx>(
     if cx.tcx.is_impl_trait_in_trait(ty.skip_binder().def_id) {
         let bounds = cx
             .tcx
-            .bound_explicit_item_bounds(ty.skip_binder().def_id)
+            .explicit_item_bounds(ty.skip_binder().def_id)
             .subst_iter_copied(cx.tcx, ty.skip_binder().substs)
             .map(|(pred, _)| pred)
             .collect::<Vec<_>>();
@@ -1316,7 +1316,7 @@ pub(crate) fn clean_middle_assoc_item<'tcx>(
 
             if let ty::TraitContainer = assoc_item.container {
                 let bounds = tcx
-                    .bound_explicit_item_bounds(assoc_item.def_id)
+                    .explicit_item_bounds(assoc_item.def_id)
                     .transpose_iter()
                     .map(|bound| bound.map_bound(|b| *b).subst_identity());
                 let predicates = tcx.explicit_predicates_of(assoc_item.def_id).predicates;
@@ -1847,7 +1847,7 @@ pub(crate) fn clean_middle_ty<'tcx>(
             // by looking up the bounds associated with the def_id.
             let bounds = cx
                 .tcx
-                .bound_explicit_item_bounds(def_id)
+                .explicit_item_bounds(def_id)
                 .subst_iter_copied(cx.tcx, substs)
                 .map(|(bound, _)| bound)
                 .collect::<Vec<_>>();

src/tools/clippy/clippy_lints/src/future_not_send.rs

@@ -64,7 +64,7 @@ impl<'tcx> LateLintPass<'tcx> for FutureNotSend {
         }
         let ret_ty = return_ty(cx, cx.tcx.hir().local_def_id_to_hir_id(fn_def_id).expect_owner());
         if let ty::Alias(ty::Opaque, AliasTy { def_id, substs, .. }) = *ret_ty.kind() {
-            let preds = cx.tcx.bound_explicit_item_bounds(def_id);
+            let preds = cx.tcx.explicit_item_bounds(def_id);
             let mut is_future = false;
             for (p, _span) in preds.subst_iter_copied(cx.tcx, substs) {
                 if let Some(trait_pred) = p.to_opt_poly_trait_pred() {

src/tools/clippy/clippy_utils/src/ty.rs

@@ -90,7 +90,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
                         return false;
                     }
 
-                    for bound in cx.tcx.bound_explicit_item_bounds(def_id).transpose_iter() {
+                    for bound in cx.tcx.explicit_item_bounds(def_id).transpose_iter() {
                         let (predicate, _span) = bound.map_bound(|b| *b).subst_identity();
                         match predicate.kind().skip_binder() {
                             // For `impl Trait<U>`, it will register a predicate of `T: Trait<U>`, so we go through
@@ -268,7 +268,7 @@ pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
         },
         ty::Tuple(substs) => substs.iter().any(|ty| is_must_use_ty(cx, ty)),
         ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => {
-            for (predicate, _) in cx.tcx.bound_explicit_item_bounds(*def_id).skip_binder() {
+            for (predicate, _) in cx.tcx.explicit_item_bounds(def_id).skip_binder() {
                 if let ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) = predicate.kind().skip_binder() {
                     if cx.tcx.has_attr(trait_predicate.trait_ref.def_id, sym::must_use) {
                         return true;
@@ -744,7 +744,7 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: AliasTy<'tcx>) -> Option
 
     for (pred, _) in cx
         .tcx
-        .bound_explicit_item_bounds(ty.def_id)
+        .explicit_item_bounds(ty.def_id)
         .subst_iter_copied(cx.tcx, ty.substs)
     {
         match pred.kind().skip_binder() {